It's a bit soon, isn't it? Are you already tired of the Xbox Series X? We might see some variations of the Xbox Series S this year, but an entirely new generation of consoles? That's several years away. 8th Generation lasted 8 years from 2012-2020.
I really hope that whatever they do, they make name line up with either PS or the console generation. Like call it the Xbox X5 (to align with former) or Xbox X10 (for the latter) or something to that effect.