Apple has set September 12 as its most important day of the year when the world's most valuable public company will unveil the next iPhones. A couple of hours later, images of two of the new devices appeared online.

The event will be held in Cupertino, California, at the Steve Jobs Theater on the company's Apple Park campus, according Apple's website. "Gather Round," the invite said, likely referring to the shape of the company's new campus.

The company will unveil its renewed iPhone strategy at the event. It's planning three new models that look like the iPhone X, including a refresh to the flagship device, a larger premium model, and a larger, cheaper model that comes in different colors. All three devices will have facial recognition and edge-to-edge screens like the iPhone X, but the two premium models will have OLED screens, while the cheaper phone will use LCD technology, Bloomberg News has reported.

Later on Thursday, website 9to5Mac published photos of two new iPhones and a new Apple Watch. The images corroborate earlier Bloomberg News reporting that the new high-end devices would come in two sizes, feature a gold colour option and use the name iPhone Xs. The image of the Watch shows a new face that displays more information and a bigger display.

Seth Weintraub, who owns 9to5Mac, said the photos were spotted on a hidden portion of Apple's website and are actual photos of the products to be announced in September.