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Seems like one of their classic updates, with it’s own page:
http://www.teamfortress.com/uberupdate/

They’ve also updated their site.
http://www.teamfortress.com

The major changes include:
* Added 6 new weapon sets!
* Added over 25 additional new weapons!
* Added over 30 new hats!
* Added 5 new community contributed paint colors!
* Most hats are now paintable
* Added 4 new unusual effects
* Added a new matchmaking system that allows players to easily and quickly join matches
* Added main menu option to view Meet the Team videos and comics
* Added new startup music, “Ze Hurting is More Rewarding”
* Hooked up new community contributed voice responses to Engineer
* Added community contributed weapon sounds to most weapons
* Added new kill icons. Every instance of death should have a kill icon.
* Added new Payload map, Barnblitz
* Added new Payload map, Cashworks
* Added new mode: Raid and 2 new Raid maps. This mode is a boss based mode similar to the Halloween event.
* Added Capture the Flag to the list of modes supported by Badlands
* Added 15 new achievements
Map Changes
Itemtest
* Improved loading time for map by reducing resources needed.
* Fixed several minor glitches with items not behaving as intended
* Fixed rare crash caused by material overflow
* Added tooltips to the Itemtest menu

Weapon Changes
Loch-N-Load
* Now reloads two granades
* Added new reloading animations
* Fixed grenades not shattering when hitting certain world entities
* Added a new, unique grenade model.
* Fixed damage spread not being applied correctly

Shortstop
* +10% reload time
* Slightly tweaked the damage falloff at medium range.

Eyelander
* Removed random crit penalty
* Lowered speed bonus given for each head

Half-Zatoichi
* Increased range to match other swords
* Now only heals 50% of health from each head taken

Frying-Pan
* Can now be equipped on Heavy and Pyro

Crusader’s Crossbow
* Will now reload more like the Flaregun
* Added unique projectile
* Now uses Needlegun taunt
* Improved model based on creator’s suggestions
* Slight reloading animation tweak

Fan-Of-War
* Mark of death now lasts 30 seconds
* Added new sound effects for hitting and mark of death

Kritzkreig
* Improved quality of textures and model

Rocket Jumper
* Removed damage penalty
* Made craftable, and added to random drops. Previously purchased RJers are now vintage and tradable.
* Added unique model

Sticky Jumper
* Added unique model
* Replaced damage vulnerabilities with +100% explosive damage taken.
* Made craftable and added it to the drop system. Previously purchased SJers are now vintage and tradable.

Sorry, I didn’t see it in recent posts
*lock*