Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

• Halloween 2011 Event
  
  • Viaduct has been haunted and is now... Eyeaduct!
    
  • One full multi-piece costume set has been added for each class
    
  • Random gifts containing costume pieces drop in Eyeaduct on registered servers
    
  • 2 new Halloween 2011 achievements
    
  • Any unusual hats uncrated during the event will be Halloween-themed
    
  • New Halloween-themed items are available in the Mann Co. store, but only for a limited time!
    
• Updated effects for The Cow Mangler 5000
  
• Updated in-game abuse reporting tool to include option for reporting abusive game servers
  
• Added mapcycle_halloween containing all Halloween event maps
  
• Fixed team colors and styles not updating properly in store previews
  
• Fixed bug in reputation trend status display for registered servers
  
• Fixed a problem that could cause repeated stutters after joining a server
  
• Fixed the Spine-Chilling Skull not appearing when equipped by soldiers
  
• New Halloween-themed community-created items submitted to the Workshop are now available in the Mann Co. store!