Valve, the creators of such series as Half Life, Left 4 Dead and Portal may have had proof of the development of Half Life 3, Left 4 Dead 3 and Source Engine 2 leaked.
via N4G: pc news feed http://n4g.com/news/1285191/half-life-3-l4d3-and-source-2-production-confirmed
via N4G: pc news feed http://n4g.com/news/1285191/half-life-3-l4d3-and-source-2-production-confirmed