That sounds awesome! hope they keep the OG Xbox's Y2K aesthetic on the menus!
HWYR if an SSBU Deluxe was made for next-next gen consoles (yes, plural - this is assuming Nintendo goes 3rd party), with the following new content on base game:
All DLC (inc. Spirits) on disc, a stripped down download-only "battle version" with only multiplayer modes is also available
Multiple new alternate costumes, both recolours and model changes
2 fully new characters on disc: Waluigi and Knuckles
3 new echo fighters: Funky Kong, Paula, Ms. Pac-Man
All stages that aren't in SSBU (sans Miiverse and with Pyrosphere/Jungle Hijinx/Pac-Maze lacking their old gimmicks) return, including single player stages.
Built-in Mii maker with asymmetry, non-realistic colours for skin, and multiple new facial features included
Exclusive Sony and Microsoft-themed Spirit Boards
Multiple moveset revamps for characters such as Sonic and Ness.
along with the confirmation of a Fighters Pass 3 and 4, developed without Sakurai's involvement?