Has the desire for hats, hats, delicious TF2 hats diminished over the last few years, or is the public's interest in digital head-adornment as strong as ever? I ask because Valve and Irrational are adding BioShock clobber to Team Fortress 2, and- hey, don't all load up the game at once. You'll need to buy BioShock Infinite's season pass on Steam to gain access to it, which I believe comes with a few pieces of downloadable content in addition to a very small selection of hats.
Full details here
The items are only available until the 25th of March - the date that Burial at Sea part 2 is scheduled to release - and comprise a Mister Bubbles doll, a George Washington and a Benjamin Franklin mask. It's not a whole lot of content, but if you still play TF2 and you already own a season pass, then free stuff is always nice, I guess. Here's a pic of that digital clobber, as modelled by the cast of TF2: