I think he actually might get a VU, possibly a substantial one. Mostly because from the Reborn promo, the brief silhouette of him shown doesn't match his classic skin in many areas, and he doesn't look like he's in his Tyrant skin either (definitely not the helmet or shoulderpads).
The differences in the promo, are some things that are pulled from his Tyrant skin. His cane is a clawed staff, Beatrice is larger and looks a bit more like that weird pigeon-turkey thing she is in the Tyrant skin; shoulderpads also look slightly different.
Also lore-wise, the Tyrant skin is technically his current lore appearance because that's what he was wearing in the last issues of the Journal of Justice when he became the Grand General. And in the Tyrant skin, he doesn't limp anymore, hence he doesn't use a cane but a staff instead.
So if they were going to make all the other skins consistent, animation changes like removing his limp and his cane in the other skins would seem to fit. It's a bit of a weird situation because while usually the 'classic' skin is considered the actual 'lore-look' of the champ, the Tyrant Swain skin is what Swain currently looks like because it was featured in the JoJ. It also features some physical changes to Swain such as his walk cycle, which means lore-wise he shouldn't limp anymore.
That's what I think anyway. Could be just a nice texture VU, but I have a feeling it'll be come more than that. Along with the animation tweaks, maybe some slight champ mechanics update too?