The first post-Orange release of the Source SDK is being made ready for release. This release will allow Mod authors to create custom maps and additional content for Episode Two, Team Fortress 2, and Portal. A follow-up release to allow Mod authors to create custom Mods based upon the Episode Two client and server code will be next.
Inoffiziell geht schon: portal-mods.com/forum/viewtopic.php?t=70