Could this be the game GSC always intended to make? PC Gamer investigate the true nature of the S.T.A.L.K.E.R. prequel:
"We've followed the development of the apocalyptic survival shooter closely over the years, and we've seen it change radically. The game that we finally played in 2007 was remarkable in many ways, but it was far from the revolutionary freeform vision originally conjured for us by the Kiev team.
Now they're making a game a little closer to that original dream. They're making another Stalker. A prequel named Clear Sky. And we have every reason to be excited, because our second journey into the Chernobyl exclusion zone promises great things."