TF2 Team Aren't Working On A Hat

According to some typically cryptic words on the Team Fortress 2 blog, 2012 holds a "secret project" for the game, and they promise it is neither a hat, nor a map. But they don't say what it actually is. And there comes the promise that this year will finally see the final Meet The Team video, giving the Pyro the coverage she so deserves. And apparently it's going to contain an awful lot of blood. But no mention of fire. Finally, there will apparently be a more imminently revealed secret related to the Saxxy Awards. But who knows.

So I challenge RPS readers to speculate - what is the next new inclusion for the game? An entirely new game mode? A new character to muddle all the balancing? An RPG set in the TF2 universe in which you play as a struggling Scout, trying to find his way in the brutal world? A new hat?