Yosemite Sam wrote on Mar 5, 2014, 18:13: Well we know Valve has been working on Source 2. So I would think they will build their flagship game to showcase the new engine. I hope it's as revolutionary as Source was when it finally got showcased. I still remember the jaw dropping abilities of Source when it was shown way back in 04.
They call the next major upgrade of the Source engine Source 2. When you play L4D2 or Portal 2 you're playing on an engine that at one time was branched/referred to as Source 2.