The next game from S.T.A.L.K.E.R. dev GSC is… Cossacks 3

EG:

Surprise! The next game from S.T.A.L.K.E.R. developer GSC Game World is not a new S.T.A.L.K.E.R. but a new Cossacks.

GSC Game World had been thought dead and buried, with Vostok Games, the studio that formed when GSC collapsed, picking up the mantle with thematic successor Survarium.

But it's been working on Cossacks 3 in secret for a year-and-a-half, and the game is due out at some point during the fourth quarter of 2015 for Windows PC, Mac OS and Linux.