Left 4 Dead WWW Link looks rather interesting.
It appeals to the semi-retired FPS in me.
What I like most about this particular FPS is that without a supreme team effort, you simply won't survive alone... that simple!
No "running and gunning", twitch-fest here it seems in this game... stay together, conserve ammo, plan your moves, communicate with your colleagues and you will escape.
(and it looks darn scary too)