One of the highlights of the tech calendar is approaching as Apple hosts its latest unveiling on Tuesday.

The presentation, called "Wonderlust," continues Apple's tradition of turning product announcements into must-watch events. However, what will be announced has been a well-guarded secret.

Apple is expected to preview the latest edition of its iPhone and a major update to its operating software at the event. It could also be the first-time customers will see the influence of European Union regulations on the company's product design.

Here's what's rumored to be debuting at Apple's "Wonderlust" event, including iPhone 15, Apple Watch, AirPods, iOS 17 and USB-C charging ports announcements.

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iPhone 15

The iPhone 15 is the top-line announcement expected from Tuesday's event. Apple is planning to debut the iPhone 15, 15 Plus, 15 Pro and 15 Pro Max, according to Bloomberg.

The most notable change is the phone's switching from Lightning charging ports to a USB-C port to comply with European Union common charger laws.

At the Wall Street Journal’s Tech Live conference last October, Greg Joswiak, Apple’s senior vice president of worldwide marketing, said the tech giant would abide by the regulations.

The iPhone 15 Pro models are switching to a chassis made of titanium instead of the stainless steel found on the base models, according to Bloomberg.

The iPhone 15 Pro Max models are also expected to have an improved camera system that will allow for greater optical zoom.

The regular models will debut in five colors – pink, black, white, blue and yellow – while the Pro models will come in gray, black, dark blue and white, according to Bloomberg.

iPhone evolution:How it evolved from the original to the anticipated iPhone 15 release

Apple Watch

The second announcement generating buzz from Apple fans is an update to the Apple Watch, though it's unlikely that there will be major design changes.

The Apple Watch is expected to have an upgraded processor, their first new chip since the Series 6 in 2020, Bloomberg reported.

AirPods

The iPhone is not the only Apple product making the switch from Lightning to USB-C charging ports.

Apple is expected to announce an AirPod charging case with USB-C charging ports, according to Bloomberg.

The earbuds are also expected to get a software update that will improve automatic device switching, the ability to mute and unmute from the AirPods and Conversation Awareness – a new feature that automatically silences media when people speak to the wearer, Bloomberg reported.

iOS 17

A release date for the latest version of Apple's operating system is expected at the event.

iOS 17 is currently in beta testing and appears to be a major update with a slew of new features, according to MacRumors.

Notably, the update includes live voicemail screening, updates to the autocorrect and predictive text features and Apple TV connectivity for FaceTime calls.

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