Looks like the next class update for TF2 is going to be the Sniper.

This Jarate looks rather interesting though. I'm guessing it will probably be the melee weapon replacement, since I can't see it replacing the Sniper Rifle or secondary gun. Whatever the case, it looks fun, yet disgusting... also, very Aussie :P.

EDIT: This is most likely an April Fool's joke from Valve. It was actually the 2nd when I saw this on Steam.

EDIT EDIT: Guess it wasn't an April Fool's after all. Or perhaps the joke was that there wasn't a joke after all? In which case, bravo Valve, you've had us fooled for months!

Here's the REAL link confirming the Sniper will be the next update.