Gears of War
One of the most impressive 360 titles in development, Gears of War features RE4's atmospheric over-the-shoulder gunplay, crossed with the speed and team strategy you'd expect from the developer behind the Unreal series.
It looks stunning, and seems to have a firm grip on the art of action-packed set pieces. Still not sold on 360? Gears of War could tip the balance.
Gears of War will be out in the summer, hopefully.