A PR manager at GSC Game World suggested in an interview that a remake of the original STALKER may be in the making. Moreover, his statement indicates that the upcoming STALKER 2: Heart of Chernobyl seems to have more in common with the cancelled sequel than originally thought.
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STALKER 2 is supposed to feature a brand new faction called "Noon" (translated from Russian), which was confirmed by youtuber (03:06) known as "Doesn't matter who" (translated from Russian). On the social network website VK there was information that the group was to be led by Vagabond, known from the Call of Pripyat. In addition, mention of this group appears in one of the game's endings. Thus we know that it would be canon in S.T.A.L.K.E.R. 2: Heart of Chernobyl. But that's just the beginning of the flood of information we've received in recent days.
A word about NIICHAZ:
What is the aforementioned institute? The first mention of it appeared already in one of the endings of Call of Pripyat. It was to have official custody of the territory and be home to numerous scientists. This is where our adventure would begin and end in the original version of the sequel, which never saw the light of day. It was also the only location for which a reasonably functional prototype was created.
Most of the rooms were supposed to be open to the player. The outpost occupied a fairly large area surrounded by barbed wire, where we could find the main complex, as well as several smaller buildings: a 3-story hotel, a warehouse converted into a shooting range, a small bar and a decontamination chamber for those returning from the Zone. Nearby was a camp for "illegal" stalkers - those who had gotten on the institution's bad side - along with a black market.

What alleged role did NIICHAZ play in the plot of the canceled STALKER 2?
Inside the complex, we were supposed to come across the office of Strelok (the protagonist of Shadow of Chernobyl), acting as a consultant who, shortly after the story began... would be killed by an explosion in the facility. The main character would be wrongly blamed for the incident, but he would quickly be helped by an unknown stalker.
Thus, we would catch the trail of a conspiracy formed by officials inside the institute. Their goal was to create an installation that could change the Zone's ecosystem forever. The Exclusion Zone's future would rest in the hands of the player.
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