Japanese site AppBank were browsing the App Store the other day when, oh, hello, what did they find but a copy of Resident Evil 4. For the iPhone.
It's since been taken down, but as you can see from this clip, it's pretty unlikely this is a fake. That sure looks like a real iPhone game, right down to the crummy controls and pointless dilution of a classic console title.
Since it's been taken down, and Capcom know the cat's out of the bag, we can hopefully (?) expect more details on this game in the near future.