Uh Oh, Valve will not be pleased with this leak. According to an internal change log image of the Valve Tour Group, it seems like Source Engine 2 and Left 4 Dead 3 has been accidentally confirmed.
The game will also be free-to-play, according to the leak. Valve hasn’t been shy of making its games F2P, in fact, Team Fortress 2 went F2P and has generated a lot of revenue for the company. Something like Left 4 Dead 3 poses a lot of monetisation opportunities so if it does turn out to be a correct leak then it won’t be a surprise.
The zoomed out version of the image can be found below.