I'd rather expect 4k/30 FPS from Lockhard across the board as I doubt it will be that much stronger than X to double the framerate. I mean in some games, sure but not in Gears 5 or Halo Infinite (new engine) and probably not even in Forza Horizon 5.
Besides, if Lockhard can already do 4k/60, why would we even need a stronger console? A few more effects? 8k? 90FPS?