This Wednesday, at their annual special music event, Apple will most likely introduce the final version of iOS 4.1 for iPhone and iPod touch (though probably not for iPad). Apple released the first beta for iOS 4.1 on July 14 and stuck to their every-two-weeks cycle for beta 2 on July 27 and beta 3 on August 3.
What we've seen so far includes a new, font-crazy version of Game Center, which was also included in the iOS 4 betas but removed for the general release, and FaceTime connections over email, which will be required for non-phone devices like iPod touch 4.
It will also likely contain bug fixes for the proximity sensor, and hopefully performance fixes for iPhone 3G.
Those features are certainly impressive, those fixes certainly much needed. But is that all we'll get? There's no way to know what Apple will do in the future, but we can look at what they've done with past iOS x.1 releases for clues...