Updates to Source SDK have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
SDK Launcher, 'Half-Life 2', 'Episode 1', 'Episode 2', and 'Counter-Strike: Source' now default to the 'Source Engine 2009' engine configuration.
Users developing content for these games should manually add configurations for these games in the context of the 'Source Engine 2009' engine or can simply use the 'Reset Game Configurations' utility.