Casual Mode
Matches can now start with fewer than 24 players when there are not enough compatible players in queue
The match will still add additional players (up to 24) as they become available
This should improve queue times for low-population regions and game modes
Added maps cp_gullywash, cp_snakewater, and koth_probed
Fixed not being able to cycle between spectator modes
Weapon viewmodels
The field-of-view slider has been re-added to Adv. Options menu (range: 54 to 70 degrees)
This feature is now allowed in Competitive Mode

Go to teamfortress.com for all the changes/fixes.