As Vostok Games' description notes, with S.T.A.L.K.E.R. 2's development is cancelled or "frozen". No official word has come out, but we can consider it confirmed. The rights to the brand lie with GSC's founder Sergiy Grygorovych according to the GSC StalkerTwitter, but stalker-gsc.ru offers a quote from the same person that Bethesda published the IP. EDIT: the STALKER facebook feed confirms Bethesda did not buy the property.