This latest report follows a tidbit last week from French site App4Phone.fr (English translation), which pointed to a September 21 release date based on intel from Chinese manufacturing sources. The spacing itself jibes with last year's schedule when Apple unveiled the iPhone 4S on October 4 and then released it 10 days later.
iMore's sources were apparently mum about a launch date for the iPad Mini, but the site says it could reach consumers on the same day, a logical assumption. The smaller iPad would reportedly be exactly like its 9.7-inch brother, but just on a 7-inch scale.
Reports have surfaced about a new iPod Touch in the works, which could also be announced on September 12 as part of the upcoming lineup. A new iPod Nano may also be part of the mix. That promises a busy day launch day for Apple, but the company typically spruces up its iPhone announcement with updates to the iPod and other products.