How would you know they could even RELEASE IT? There is no information to suggest that it is done or unfinished. All we know is that it is a project Valve is working on.
The whole point is of how it angers me that after almost three years now, not a single detail except a few drawings. There have been now follow ups on anything regarding this title, and that angers me.
Left 4 Dead wasn't a bad game really. it had some flaws, yes, but the gameplay was solid and addicting. It's just the feel of the game becomes boring after a while.