Ars Technica notes on some details about a patent, filed last year, about gaming on the iPhone. The patent details using a part of the screen to show the game. Another section of the screen functions as an input that can control both the game and other multitasking apps outside of the game, such as the iPod music app. The patent also details using the gaming control app alongside a game scene. The control area controls multiple apps at the same time depending on where you tap and flick? I think that's the gist of it.
I wouldn't get my hopes up for Apple releasing a game based on this anytime terribly soon; patents aren't reliable indicators of when a feature is forthcoming. Indeed, we might never see this, at least, not from Apple. It could also be the basis for multi-tasking on the iPhone when apps become available, you never know.