The good ol' folks at Valve have wrapped up work on Left 4 Dead 2, which means that the TF2 team are back in action, and today they're blogging about some of the models seen in their Meet the Sniper video. You can see pictures of all of these models (or "assets") at the blog here.
You can now also use all these models and assets in your Team Fortress 2 maps. The models should all have been downloaded by your Steam installation automagically, but you still need to refresh all SDK content for them to show up in Hammer. Have fun mapping; I look forward to seeing all these things in some old-fashioned Capture the Flag maps.