Two weeks ago in Japan Resident Evil 4 for the iPhone/iPod Touch was leaked and pulled by Capcom. The game however has now been released by Capcom and Apple.
The iPhone/iPod Touch version of the game has extensive modifications to the game controls in order to accomodate the lack of physical buttons. The game however, is identical to the console versions (with minor differences for graphics of course). It's available for purchase and play. (approximately $8.99)