Obviously nothing is official, but here are the Bethesda games we could realistically see coming to GamePass permanently in the near future:
Brink (?)
Deathloop (approx. 1 year after PS5 version)
Dishonored Definitive Edition
Dishonored 2
Dishonored Death of the Outsider
Doom (1993)
Doom II
Doom 64
Doom 3 BFG Edition
Doom
Doom Eternal
Enemy Territory: Quake Wars
Fallout 3
Fallout New Vegas
Fallout 4
Fallout 76
Ghostwire: Tokyo (approx. 1 year after PS5 version)
Hunted: The Demon's Forge
Prey
Quake 4
Rage
Rage 2
Starfield
The Elder Scrolls III Morrowind
The Elder Scrolls IV Oblivion
The Elder Scrolls V Skyrim Special Edition
The Elder Scrolls Online
The Elder Scrolls VI
The Evil Within
The Evil Within 2
Wolfenstein 3D
Return to Castle Wolfenstein
Wolfenstein (2009)
Wolfenstein The New Order
Wolfenstein The Old Blood
Wolfenstein II The New Colossus
Wolfestein Youngblood
Wolfenstein III