As mentioned if it's not the original team then I won't really have any big hopes for it. We'll see if they manage to capture the same atmosphere as the previous games.
With Unreal Engine im doubtful that they will recreate magical atmosphere from original Stalker series. Unreal Engine 4 is very clean and sterile engine. I would be much more hyped if this game was developed by 4A Games, not only they have better talent, more manpower but also they developed Metro series which is very good, and they are definitely more capable than GSC to bring us worthy continuation. GSC Game World last game are Cossacks 3 which is pretty bad from what i heard, didnt played it.
Cossacks 3 was released 20 september 2016, probably they started working on Stalker 2 after Cossacks release. Im cautiously interested, definitely not hyped.