The head of GSC Game World has posted on his Facebook post about S.T.A.L.K.E.R. 2. He recalls that the game is still being developed, and is also sharing the emotions of the process.
His exact quote is:
A year ago, I announced S.T.A.L.K.E.R. 2, and at the beginning of the development I decided that there should be either a cultural event or nothing. Now I can say that I like. And we will not talk much this time, we do. The team feels your support, thank you all!
The studio recalled the game at the end of March 2019, releasing the first poster. And fans of the series with might and main unravel the secret message (or as it seems to them) from the developers.
About S.T.A.L.K.E.R. 2 so far there is no exact information.