A very mysterious countdown was added to the official Team Fortress site today. The countdown at the time of writing has a little more than 4 hours remaining and there is no indication as to what the countdown is for. Could this be the moments leading up to a huge content drop for Team Fortress 2 or perhaps even a Team Fortress 3 announcement? Fans everywhere are coming up with theories as to what the countdown could be for as they eagerly await for the last few hours to pass.

There are tons of possibilities as to what Valve could have in store for us, and the only way we'll know for sure is to wait for the countdown to finish. What are your thoughts on what the countdown could be for?