Curious Valve fans over at Valvetime.net have dug out code segments in Source Filmmaker that refer to Source 2 - the next gen engine from Valve. Obviously, Source, that debuted with Half-Life 2 has been tremendously adaptive, but it is commonly thought that Valve are holding off the next chapter of the Half-Life series until their new engine is ready - so any mentioning of Source 2 gets a big thumbs up from us!