Stalker Oblivion-Lost.com has the English translation of a post by THQ's Max Stellar to the official German forum for S.T.A.L.K.E.R.: Shadow of Chernobyl commenting on the just-announced delay for GSC Game World's upcoming first-person shooter (story). Saying a press release would probably show up with more detail on this shortly, he describes the complications testing the game's dynamic life simulation system:

Simply put: The developers have to play through S.T.A.L.K.E.R. again and again and examine how the other stalkers and creatures react and how this influences the whole course of the game. I am glad that THQ does not release the title under time pressure, but offers the necessary time that the development requires, so that GSC can live up to the high expectations.