https://arstechnica.com/gadgets/2018/08/apple-to-debut-new-iphones-during-september-12-event/

Apple will unveil its newest devices at an event on Wednesday, September 12, at the Steve Jobs Theater at its Cupertino campus, as confirmed by invites sent to media today. The invite didn't provide any more details about the event, but it was accompanied by a graphic of a circle with the phrase "Gather Round" underneath it. It's unclear what that image may be referencing, but it does resemble Apple Park's circular shape.