I know this has been posted in the shoutbox, but it deserves more than that:

The next class pack will focus on the Sniper. It's actually shaping up to be the largest TF2 update yet, with multiple new maps and a bunch of gameplay tweaks. In addition, we've got another update in the works that should be done before the Sniper, and that one will include some new content for all classes.
Find it here.

I can't wait already, even though I want the Engineer and Spy update about 1 million times more! Oh, and wave goodbye to yer head, wanker .