Huge gears of war fan... but that particular game type can not and will not ever make it on the iPhone. Like I have said a million times, Apple and the developers need to stick with Wii type games for sure. They have to take advantage of the controls that they have to work with.
How 'bout some type of RTS game. Age of Empires or Rise of Nations themed. Or a better sports selection. Real Soccer proves it can be done successfully on the iPhone. EA Sports College Football on the iPhone would definetely get me sent to the unemployment line.
Like some others said, a Civ-type game would be awesome, or maybe they could port the old-school arcade game Dragon's Lair... that would be sweet with the accelerododad.