Since VALVe's release of the critically acclaimed "Team Fortress 2" we've all been waiting for a sequel.
VALVe has some amazing community service for Team Fortress 2, but not enough to make me a die-hard fan.

VALVe are currently working on Portal 2, Half-Life 2: Episode 3 and they just finished Left 4 Dead 2. They might have 2 projects to work on, but that didn't stop them from announcing and creating Left 4 Dead 2.

So, what I would like to see in a new Team-Fortress game would be:
An entirely different Team Fortress game with the same style in visuals and stereotypes. A balanced class-based game with loads of community support and modification abilities.
If you agree, join this group. Invite your friends if you want.

"We want Episode 3" group.
"We want Portal 2" group.
"We want Counter-Strike 2" group.