An update to Team Fortress 2 has been released. The update will be applied automatically when you restart Team Fortress 2. The major changes include:
Mann vs. Machine

• Operation Two Cities
  • Two new maps: mvm_mannhattan and mvm_rottenburg
  • New advanced tour featuring four missions
  • Two extra Boot Camp-only missions
• Added 14 new achievements
• Tour of Duty badge levels are no longer limited to 200
• Players can earn a "Refund Upgrades" credit by collecting money during waves
  • The amount required is listed in the scoreboard, and varies per-mission
  • Any money collected – whether winning or losing – will count toward earning a credit
  • To redeem, visit an Upgrades station and click the "Refund Upgrades" button
  • Any money spent on buy-backs and Canteen charges will not be refunded
• Detailed player performance stats added to the scoreboard
  • Damage and Tank. Total damage done to Gray Mann's forces.
  • Healing. Direct healing done to other players.
  • Support. A composite value that reflects anything a player has done to help their team:
    • Examples: reset a bomb, stun or slow an enemy, provide increased damage, block damage with invulnerability or shield, and lots more.
  • Money. The amount each player has collected.
• Players can inspect upgrades on teammates via the "Inspect" key ("I" by default)
• Fixed the Romevision tank not animating
• Medic
  • Revive (no upgrade required)
    • Teammates leave behind a revive marker when they die
    • Target the marker with your medigun to revive them
  • Projectile Shield Upgrade
    • Build Energy by healing teammates, reviving and preventing damage via Invuln ÜberCharge.
    • Press ATTACK3 to activate when Energy meter is full (mouse3 by default)
    • While active:
      • Blocks all enemy projectiles
      • Damages enemies on touch
  • Mad Milk Syringes Upgrade
    • Syringe Gun needles apply Mad Milk (heal-on-hit for teammates) on contact
  • Healing Mastery Upgrade (previously two separate upgrades)
    • +25% heal rate per point
    • +25% revive rate per point
    • +25% self-regen rate per point
  • Overheal Expert Upgrade (previously two separate upgrades)
    • +25% more overheal per point
    • +50% duration per point
  • Canteen Specialist Upgrade
    • Shares canteen charge effects with heal target
    • +1 second charge duration per point
    • -10 canteen charge price per point
• Soldier
  • Rocket Specialist Upgrade
    • +15% rocket speed per point
    • On direct hits
      • Stuns target (duration increases per point)
      • +15% increased blast radius per point
      • No range-based falloff damage
• Heavy
  • Attack Projectiles Upgrade
    • Now has two levels
      • Level one is less effective than before
      • Level two is more effective than level one used to be
    • Price reduced from 600 to 400 per point
  • Rage Pushback upgrade activation moved to ATTACK3 (mouse3 by default)

General

• Added a new community map cp_snakewater_final1
  • Added new map stamp and strange filter to the Mann Co. Store
• Added new achievements for Snakewater, Process, and Standin
• Older event crates no longer expire on login, but have been updated to indicate they can no longer be opened
• about:blank should now be a legal URL and won't get blocked for MOTD
• Fixed bots using the Phlogistinator being able to airblast enemies
• Fixed the stock Shotgun not appearing in the backpack with "Show stock items" option turned on
• Fixed a problem causing map stamp leaderboards to not update under certain circumstances
• Weapons
  • Baby Face’s Blaster
    • Speed penalty changed to -10% (From -35%)
    • Boost is now only partially lost on air jumps instead of all jumps
    • Reduced Clip Size to 4
    • Removed 40% more accurate attribute
    • Removed Damage Penalty attribute
    • Speed at max boost is same as before (520)
  • Amputator
    • Added -20% damage penalty
    • Added +3 health per second when Weapon is Active bonus
  • Crusader’s Crossbow
    • Updated damage over distance: bolts now do a maximum of 75 damage (+variance) at max distance
  • Liberty Launcher
    • Added 25% reduced self damage from rocket jumps
  • Eyelander
    • Moved the eye glow position to Demoman’s eye patch. Changed the color to Cursed green.
• VR Mode
  • Now supports resolutions other than 1280x800
  • Now supports cloning the main display (instead of using the Rift as an extended display)
  • Sharpness of the output has been significantly improved
  • Head-and-neck model has been fixed to remove unnecessary translation