On Wednesday morning, Sydney time, Apple CEO Tim Cook will take the stage for the first time in the Steve Jobs Theater at the company's new campus. The location represents a new chapter for the world's most valuable technology firm, and the event will usher in a new era for the iPhone. For the first time, Apple plans to unveil three new phones, including a premium model that will cast a halo over the rest of the line, and perhaps over the rest of the smartphone industry.

The new devices will not only be exciting for customers, but for investors as well.

The iPhone represents about two-thirds of Apple's sales, making it critical to the bottom line. A new iPhone launch means a strong holiday quarter that could also include more sales of other Apple products. The entire business relies on the gadget: it serves as remote control for the Apple TV box and upcoming HomePod speaker, it's currently tied to the Apple Watch, syncs with the iPad and Mac, and is home to services like Siri, Maps, and Apple Music.

Beyond the iPhone, the company is also planning a version of the Apple Watch that connects to wireless networks and an upgraded Apple TV. As previewed in June, Apple is also preparing important software updates for all of its platforms — iOS, watchOS, macOS, and tvOS — and is likely to showcase some features from those this week.

Below, we break down what to expect at Apple's most important event in years:

iPhone

Apple is planning to unveil three new iPhones, including two that are upgrades to the iPhone 7 and iPhone 7 Plus called the iPhone 8 and iPhone 8 Plus and a premium model called the iPhone X. Here's what we know about the high-end device:

• New design. This is the most obvious change, so your friends know you have the latest gadget. It's an all-new look that drops the bezels around the display. Almost the entire front of the phone will be screen save for a cutout at the top for the earpiece, selfie camera, and sensors. The sides will be a continuous stainless steel band and the back will be made of glass, like the iPhone 4 from 2010. Look for the rear cameras to be vertically aligned, not horizontally, for better augmented reality apps.

• Edge-to-edge screen. With no bezels and no borders on the top and bottom, the focus will be on the new screen: an OLED display that more accurately reproduces colours and makes content much crisper. You'll be able to see more texts, videos and website information without scrolling down because the screen will be taller than the one on the iPhone 7 Plus. Expect the whole screen to be slightly larger than the one on the iPhone 7 Plus (5.5-inches), but because of the lack of bezels, the phone's overall size will be closer to the smaller iPhone 7. The screen will also feature "True Tone" technology, a sensor that allows the screen to change temperature based on the environment, according to leaked software code.

• No Home button. Just as significant as additions to the new iPhone are the pieces that are missing. A decade after debuting the home button as the main physical control on the device, Apple is removing it for the premium model. In its place: a thin virtual bar that can be dragged up to launch features like multitasking and close apps. See our in-depth story on the change from last month.

• No Touch ID. Also gone is the fingerprint scanner. Introduced with the iPhone 5s in 2013, the Touch ID feature in the Home button let iPhone users unlock their devices in a split second. It also authenticated Apple Pay transactions and approved downloads from the App Store. For this next phone, the company tried to embed it into the screen itself, but faced manufacturing problems, Bloomberg reported earlier this year.

• 3D face unlock. In place of Touch ID there'll be a 3D facial recognition scanner for unlocking the phone. It'll aptly be called Face ID, according to the leaked code. It's designed to scan your features within a few hundred milliseconds and can work even if the device is laying flat on a table. The sensor would also be used to authenticate payments and launch secure apps. It will work in the dark, too.

• Inductive charging. This is a new feature to the iPhone, but one that's been on competing smartphones for a number of years. You'll be able to lay the iPhone on a charging pad instead of plugging it into a charging cable.

• Faster processor. Apple will flex its semiconductor-design muscles yet again with a new chip for the iPhone likely to be dubbed the A11. The component is said to be based on a new 10 nanometre manufacturing process, which means it will be more efficient so your iPhone battery will last longer. The company has also been working on a dedicated AI chip.

• New software. As usual, the new iPhone will ship with new software. This time around it's called iOS 11. Key additions include a redesigned Control Center, support for augmented reality apps, Apple Pay support in iMessage, maps for inside airports and malls, and a dedicated app for managing files. The 3D sensor will also scan your face and apply your facial expressions to new animated emoji in iMessage.

• Other models. The other two models are expected to look similar to the current iPhones, but will have a faster processor and potentially glass backs to also support inductive charging.

Apple Watch

The Apple Watch is set to see a much needed upgrade that partly frees the device from the iPhone.

• Cellular data. The most significant new hardware feature will be a wireless option that handles fast 4G LTE data. You'll be able to leave your new iPhone behind because this version of the Apple Watch can connect to cellular data networks. Imagine loading directions in maps on your wrist and streaming music while on a walk through those wireless AirPods earphones. You'll also be able to make phone calls with your iPhone's number.

• New Colours. The new Apple Watch will look physically similar to prior models, but will be offered in at least two new colours: a grey ceramic and a new coat of gold called "blush gold," according to leaked software code. The LTE models will also show a cellular connectivity meter in the middle of the watch face and include a red dot on the digital crown.

• New Bands. Since the first Watch launched in 2015, Apple has refreshed its selection of straps every six months or so. The last update happened this past March, so a new collection makes sense at this event.

• New Software. Apple is continuing to make significant changes to the Apple Watch's software on an annual basis. This year, as previewed at the June developers conference, the company is rolling out a new Siri-powered watch face that can preview your day, improvements to the Workout and Apple Music apps, and support for connecting to gym equipment. Apple is also adding its News app to the device along with the ability to send and receive money from contacts via Apple Pay.

Apple TV

Set to debut is the first update to the set-top box since its overhaul in 2015.

• 4K video streaming. The main upgrade will be support for 4K video, a standard with much higher resolution. Of course, this will require a 4K TV. Apple has been in talks with popular video streaming apps, TV studios, and movie studios about supplying 4K content for the box.

• HDR video streaming. To go along with 4K, Apple is planning to support HDR video playback as well. This standard shows video with much more vivid colours.

• Faster Processor. The updated box will feature a faster processor to handle the higher-resolution video. The current Apple TV box, introduced in 2015, features the A8 processor from the iPhone 6, which launched in 2014. For comparison, the iPhone 7 includes the A10 chip.

• Improved live TV integration. Right now, users can access live TV streams from a number of Apple TV applications by asking Siri or launching those respective apps. Apple is testing expanding that access to its own TV app launched last December. That means no more clicking on different app icons, although you'll still have to enter any required login details.

Coming Later

This week's event won't be it for new Apple products in 2017. The company promised two major launches for December, a new product category and a souped up Mac to appeal to the company's small, but important, professional user base of video editors, photographers, and software programmers.

• HomePod. The Siri-powered smart speaker, introduced in June, ships to customers in December. The speaker will be a gateway to Apple Music in the home by way of speakers that can adjust to conditions in different rooms. Apple could provide more details on the speaker's functionality at the iPhone event.

• iMac Pro. Also shipping in December is a high-end version of the iMac. Like the current iMac, this one will have a high-resolution 5K display, but the internals are all new. The machine packs in some of the fastest processors and graphics chips on the market and starts at $4,999. Apple has also said that it's working on a new Mac Pro (the company's high end desktop without a built-in screen) and a new external monitor for professionals.

Bloomberg