In true Valve fashion, Gaben & Co. have just launched the long-awaited Source 2 engine... as part of the new Dota 2 Workshop Tools. Oddly, Valve isn't confirming that this is actually Source 2 ...

Beyond the game engine itself, this soft-launch of Source 2 also includes a brand new console called VConsole2, and a new version of the Hammer map/game editor.

The original Source engine made its debut with Counter-Strike: Source, and was used to develop games such as Half-Life 2 and Left 4 Dead.

Valve announces the Source 2 engine, which will be free to developers Steam Link also announced, Steam Controller priced and Steam Machines to roll out from November.

The next-gen Source engine is here, 11 years after the first version shipped with Counter-Strike: Source and Half-Life 2 ...

Valvetime has uncovered a bunch of references to a planned Source 2 engine lurking in Source Filmmaker's script files, so it seems that Valve is planning a new version of the Source engine.

Valve released a huge update to its modding tools, and these files suggest that the map editor has been ported to the long-awaited Source 2 engine.

Short answer: loads of new things have appeared in the Dota 2 update and everyone’s pointing at all the ‘2’s.