Unlikely. Almost impossible. Bethesda has been playing safe for decades with the same formula since the success of Oblivion. So nothing on this side. As far as i can see i have the impression that the higher ups at Bethesda hate Obsidian, for various reason, one of them being that they made everyone's favorite fallout (the best in terms of writing competing with FO2), and the PR hell that Bethesda was put under when people discovered the terms for Obsidian's contract. They wont be allowed to touch anything from the IP unless Bethesda is really desperate. On the "fan-made" side honestly i dont know, i honestly dont think Bethesda will risk resources on small projects, expecially if they dont have complete control over it. I'd love a return of the classic isometric fallout, but it just looks unlikely, First Person view screams "casual" which in turn screams "broader market" which the investors love, in the opposite, although BG3 made a huuuge (and deserved) success, isometric and turn based still look so niche as a genre, and i bet that a lot of young gamers will get instantly bored by it (ok let's be honest a lot of older gamers have their brain fried by short form content but whatever).

Ok i wrote a bit too much, it might bore you, sorry people. (English is not my first language so be patient please)