An iOS version of super-hard platformer Super Meat Boy is currently in development. According to Team Meat, the iPhone game will be rebuilt from the ground up, to work with the touch-screen controls of the iOS. Presumably, the difficulty will remain.
Super Meat Boy: The Game, as the iOS version is tentatively titled, will feature new visuals, a new soundtrack, and new gameplay mechanics compared to the original release.
There's no release date available as of yet.