In an online conference earlier this week, [GSC president, Sergey] Grigorovitch was asked whether the April 2009 calendar featuring the words ‘Call of Pripyat’ in Russian was an April Fools’ joke.
He replied that this was not a joke and would be the name of the second expansion. He added that this new expansion will be released later this year. Furthermore, a full S.T.A.L.K.E.R. title is also in development, although there’s currently no information on when we will hear more about this.