Depending on who you are, you were either excited about Bethesda buying the STALKER franchise or absolutely devastated by the possible news. So what I'm about to say next will either be good news or bad news. It just depends on how you reacted to the original rumor.
Bethesda has in fact not bought the rights to the STALKER franchise. Posted on the official STALKER facebook page was the message "Attention Stalkers: Bethesda have NOT bought the rights to the Stalker franchise!" While it could still happen in the future, it just isn't happening now.
You can view the posting below or go to the official facebook page and see it for yourself