As with the iPhone X, this larger phone would have a screen that runs from edge to edge, in an effort to maximize the display without making the phone too awkward to hold.
It follows previous rumours that the company will introduce a larger screened 6.5in iPhone - allegedly the XS Max - alongside the new 5.8in display iPhone XS, which is the same size screen as last year's iPhone X.
Apple successfully launched its flagship smartphones of the year at its "Gather Round" iPhone Xs launch event.
Another focus of the new iPhone models is their cameras.
APPLE is expected to unveil its biggest and most expensive iPhone early tomorrow morning as the tech world eagerly awaits its biggest annual product event. It'll come in black, white, red, yellow, coral and blue colors.
Finally, dual-SIM capability is also arriving with the iPhone Xs. It offers an hour and a half more battery life than the iPhone 8 Plus and features haptic touch and Face ID.
Apple may also show off new AirPods, the wireless headphones stored in essentially a self-charging dental floss box.
Going back to the idea of having two different-sized phones that started with the iPhone 6, the upgraded version of the iPhone X will now come in two sizes: the iPhone XS and the iPhone XS Max.
Pricing starts at $749 for the 64GB version (256GB and 512GB models are also available), and you can pre-order from October 19, with shipping starting October 26. The fact that the iPhone X only stuck around for one year, however, is a bit of a surprise considering it had such a heavy influence on the industry with its notch and button-shunning Face ID technology.
Apple said its new 12-megapixel dual camera system brings more detail to iPhone photos and allows users to take "more sophisticated portraits".
This iPhone Xs will have IP68 water resistance, and it'll have a display that's extremely similar to its predecessor. Sitting in between the iPhone XS (5.8 inches) and iPhone XS Max (6.5 inches), the iPhone XR features a 6.1-inch display with a resolution of 1792x828, with a pixel density of 326ppi.
Apple also introduced a fourth generation of Apple Watch with a major redesign - and a series of features created to improve its performance as a medical and health device. Expectations for Apple's lineup have been fueled by reports from Apple analyst Ming-Chi Kuo, who is based in Taiwan, where numerous contract manufactures that also make Apple products are based. The SoC contains a six-core CPU, a quad-core GPU and an improved neural engine for image processing and facial recognition for FaceID.
The three models are expected to be the iPhone X, iPhone XS Max and iPhone XR.