S.T.A.L.K.E.R. 2 Tease

GSC Game World tweets a mysterious image that seems related to their plans for S.T.A.L.K.E.R. 2 (thanks Rhialto). This is an image of the number 35, and the accompanying tweet says this mystery is already partially solved:
What is hiding in

First part of the code is solved - it's 35.

Maybe it will help you in future.