GSC have been vaguely rumbling about S.T.A.L.K.E.R. 2 for a while now, but it seems that they've decided to officially announce its development and arrival in 2012. A news article over on the company's main site makes the matter known, saying that it the technology will be "completely new" - a statement which could be aimed at rumours GSC were going to use the Crysis engine. ""After the official sales of the series exceeded 4 million copies worldwide, we had no doubts left to start creating a new big game in the S.T.A.L.K.E.R. universe," says GSC's Sergiy Grygorovych. "This will be the next chapter of the mega-popular game players expect from us."
Don't just stand there, etc. I'll get in the queue for an interview.