Team Fortress 2's Tough Break Update has landed, bringing with it 26 new contracts, a weapon-loaning program, and the ability to have your character perform dance aerobics via a newly added taunt (see above).
Completing the new contracts will grant you access to three new weapon collections you can't receive otherwise, as well as a chance of winning a unique or strange weapon plus a weekly cosmetic item box drop (which we assume includes some new hats). Speaking of weapons, the new loaner program allows you to participate in contracts even if you don't have the required weapon for it. From the update page:
"Don't have the ordinance you need to finish a weapon-specific contract? Don't worry! (Seriously, calm down.) Now you can borrow it for the duration of the contract, thanks to Mann Co's new community outreach program for wayward guns, the Loaner Program! Give double-donking a try! Lob a fresh jar of body-temperature Jarate at your enemies! Go w+m1 with the Backburner! It's like a library, but for murder accessories!"
Keep in mind, you need to buy into the Tough Break Campaign ($5.99) to participate. Opening those cosmetic and weapon cases will require a special key, of course, which sell for $2.50. The enjoyable Mannrobics taunt can be purchased for a slightly-less enjoyable $10. I just tested the loaner program, and it doesn't cost a rental fee or anything, it simply gives you the weapon you need (it's untradable and can't be used for crafting) and returns it when you're done with the contract.
In addition, the update features four new community maps (a portion of the entry fee goes to the maps' makers), one for Payload, Control Point, King of the Hill, and CTF modes. There are a couple other new taunts as well, including one where the Engineer summons a sentry-like mechanical bull and rides it while laughing (also $10), and one that allows the Demoman to play the bagpipes about as well as you'd expect him to ($5).
Naturally, there are a host of general gameplay changes that tweak weapon damage, weapon switch speeds, and a host of other bits and bobs you can read about fully here.