Updates to Counter-Strike: Source have been released that include two new movels and HDR lighting in de_dust. Valve added the GSG9 and Arctic models. The updates will be applied automatically when your Steam client is restarted. Specific changes include:

Counter-Strike: Source

• Added HDR lighting to de_dust
  
• Resized some crates in de_dust to fix players being able to peek over them
  
• Added GSG9 and Arctic player models
  
• Improved lag compensation
  
• Unified client and server player anims
  
• Bot navigation files on disk are preferred over nav files embedded in bsps
  
• Bots can use drop-down ladders

News Source: Steam News