Though it's been relatively quiet from GSC Game World, it should be known that development is continuing on S.T.A.L.K.E.R. 2. That much was revealed via a tweet earlier today from the company.
So, there you go then.
“To answer the multitude of questions we’ve been getting, #Stalker2 is currently in development, yes. However there is no release date yet.”
So, there you go then.