Totally will not happen.
Alan wake has absolutely nothing on uncharted 2, its in a completely other world.
Killzone 2 as well, alan wake cannot touch it.
Halo Reach will look awesome, but to keep the 60FPS multiplayer action with a Halo feel (open landscapes) it just wont do it.
Halo has never been a graphical power house, and Halo Reach will certainly not be either. Maybe will have Modern Warfare 2 graphics.







