GameSpot
It appears that a full sequel in the STALKER franchise is in the works as confirmed by series developer GSC Game World. A website cropped up (http://stalker2.com) and the official GSC Game World website states that the game is currently in the works.
STALKER 2 announced, scheduled for 2021 releasePolygon
STALKER 2 Is Back, Now Aiming For A 2021 ReleaseKotaku
STALKER 2 is in development, GSC GameWorld boss revealsVentureBeat
IGN -PC Gamer -Shacknews -Comicbook.com
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Source: TECH