Hopefully it will be available on 1Ghz CPU Android phones too. (HTC Desire, Samsung Galaxy S etc)
Check it out:
Yes that game is running on an IPhone 4 @ 60fps!
Btw for those asking "Who is John Carmack?", he co-founded ID Software and was the main programmer of Wolfenstein 3D, Doom 1-3 & Quake 1-3.