Left 4 Dead 3 May be in Development

An interesting screen grab made by a DOTA2 player reveals that there might be a Left 4 Dead 3 in development. Of course this is all speculation, but Valve did say they were working on a new source engine and what better way to kick it off, but with some Left 4 Dead? (Shut up, Half-life 3 will never happen) Take a look for yourself!

Via reddit