The only reasonable justification I can think of would be if the new bodies have a more advanced gfx module (not entirely sure if this is part of digic or something else, but I do recall that there is dedicated hw to assist in the UI)
If not, then honestly Canon should get a kick up the rear if they don’t offer this on the existing R5/R6. Improving the UI is something they should make pervasive, not something you only get if you upgrade.
and like others I can think of several changes
- hide whole menus I don’t use
- hide entries out of menus
- change the order of menus
- name menus (even if only my menu)
- tag options to add to My menu, not having a long scroll list
- remove the entry limit on my menu
- menu to show what my c1/2/3 settings are in comparison to the defaults
- menu to allow me to name c1/2/3
- menu to load/save/clone/rename c1/2/3
- assign menu item to button (multiple press to toggle through the options)
- menus only specific to video when I am in a video mode and vice versa
- ability to override greyed out items and it tells me what it had to reset to allow me access