Frijoles wrote on Aug 6, 2012, 11:12:
Reddit keeps saying that Valve call any game post-L4D Source 2 and that this could be nothing.

“[We] just update [Source] – not just replace it,” he said. “At some point we may say there’s Source 2 or whatever, but really for us there’s been a pretty easy way to keep it and understanding the tools. When you replace an engine, you’re replacing the tools and the way that people work, there’s an expense in man hours and people learning and people getting up on it right.”