Half Life 3, Left 4 Dead 3 leaked?

Could we be seeing Half Life 3 and Left 4 Dead 3?

According to a leaked document those references are made by a Valve employee amongst the steam box mentioned aswell.

Here is the image below


Author: Craig Green I am a avid gamer, specialise in Racing and Fighting games.Mortal Kombat will always have a special place in my heart. I am 27 years old and am newly married and live in Stoke on Trent