FROM STEAM NEWS ONLINE
Preloading of Day of Defeat: Source will begin next week. It will be released and ready to play on September 26th. Once we get closer to that date, well set an exact time for when well “throw the switch.”
Preloading the game allows people to have the entire game on their hard drive in encrypted form so that, if already purchased or pre-ordered, it will be playable at the moment it is released. Dedicated server administrators will also have some time to get their servers up and running before the 26th.