TF2 owners looking forward to earning Medic achievements, scoring the three new weapons, and playing on the cooperatively-focused Goldrush map can now log onto Steam and receive their free satisfaction.

Valve also notes that a worldwide Team Fortress 2 Free Weekend will begin on Friday at noon PDT, allowing access to the entire game for anyone with a free Steam account from May 2 to May 4.

Full patch notes after the link.

Source Engine

• Improved particle performance on multi-core machines
  
• Added FOV slider to Options | Video | Advanced for all games (moved there from TF2's multiplayer options)
  
• Fixed surround sound initialization problems with new speaker modes defined in Vista
  
  
  

• Added Goldrush
  
• Added Character Info and Loadout to the main menu
  
• Added 39 Medic achievements
  
• Added unique Medic items:
  
• The Blutsaugher, The Kritzkrieg, and The Ubersaw
  
• Added new attack animations to most melee weapons
  
• Added new speech for the Heavy and Demoman
  
• Added Stopwatch mode to Tournament mode
  
• Automatically used on Attack/Defense maps
  
• Teleporter effect no longer shows up on invisible or disguised Spies
  
• Spies disguised as their own team can now capture control points
  
• Increased force taken by pipebombs by bullets and explosions
  
• Target ID hud is now colored red or blue to match the spectator target
  
• Tournament mode no longer ends matches early if the time limit is nearly up when a new round starts
  
• Fixed exploit where clients could start benchmark mode on servers
  
• Fixed drowning exploit that allowed players to regenerate health
  
• Fixed reload exploit that allowed plays to fire instantly after switching weapons
  
• Fixed flamethrower bug where a player flush against a wall couldn't be lit on fire from the front
  
• Fixed invulnerability overlay not drawing if the invuln player was previously on fire
  
• Fixed "times used" entry in teleporters maxing out at 32
  
• Fixed rare client crash on level change during control point capturing
  
• Minor fix to stat gathering to prevent players using sv_cheats to easily garner achievements
  

• Mapmakers can now directly place the tf_gamerules entity into their map. Fixes Hammer thinking the inputs to it are broken
  
• Mapmakers can now place Engineer buildings directly into a map, with an option for them to be invulnerable
  
• Added "AddRedTeamScore" and "AddBlueTeamScore" inputs to tf_gamerules
  
• Added "SetRequiredObserverTarget" input to tf_gamerules. Force spectators to use the specified viewpoint
  

• Added setup time logic, and gates to the middle
  
• Fixed an overlay alignment bug on one of blue's gate signs
  
• Minor lighting fixes in red/blue spawns
  

• Added medium ammo and health to basement hallways
  
• Added small ammo and health to top of spiral
  
• Fixed a clip brush exploit outside blue sniper deck
  
• Fixed number "2" overlay on front of red base not being assigned to the brush face
  

• Fixed a rare crash related to bone setup