Apple invited media to a “special event” in its hometown of Cupertino, California, on Sep 9, when the iPhone maker is expected to unveil the latest versions of its best-selling smartphones.

Apple’s typically cryptic invitation read: “Wish we could say more.” It came on a simple black-and-white background dominated by the company’s familiar corporate logo. Apple is also expected to announce the iWatch at the event.

The launch date had been widely reported. Apple was expected to unveil larger 4.7-inch and 5.5-inch screens for iPhones, a move thought to be driven in part by the success of larger devices by rival Samsung Electronics Co Ltd. Tech blog Re/code also reported Apple may introduce its long-awaited smartwatch.

Apple has been discussing its “HealthKit” data service with health providers and apps developers, people familiar with the discussions say. They said HealthKit, while still nascent, will become the lynchpin in a broader push into mobile and digital healthcare, a fertile field that rivals Google and Samsung are also exploring.

Shares in Apple have rallied in past months in anticipation of the event. On Thursday, they were up 0.4 percent at $102.55 in afternoon trade.