The Xbox X has support for 8K resolution when the TV's become available, however no game will have 8K resolution.
BF5 on PC they got running in 8K @60FPS, but they used 2x Nvidia 2080Ti's which are over £1000 each.
Tomb Raider only got to 50FPS, with minimum frames at 22.
So if two GPU's which are above what is in next gen can't do it, the Xbox Series X would be lucky to hit 20FPS in 8K.
As you stated the thing I want most is improved AI - It was on the massive improvement about a decade ago, but AI did not improve at all in the last gen and certainly needs to get better.
However for at the least the next 12-18 months we will have nothing but enhanced games for the next gen.