DOOM 3 BABY!!! Quake 4 I bet is going to be more of the same. I'm pretty sure Raven software is making it, so its probably going to just be an above average fps. Nothing you haven't seen before.
People who want to deathmatch and stuff would want Q4. While those who lean more towards single player would want Doom 3. Its going to be a draw in the end I bet.