I don't know if these have been talked about, but i just played with my friend a bit and we found two things that we haven't seen anywhere:
Pac-Man's side special hitbox (for when he travels along the pac-dots) seems to be larger and last for longer. My friend (Pac-Main) says it also 'feels easier to maneuver'.
Villager; Something i noticed. When you use Lloid Rocket, Villager stops dead in their tracks. I like to use it when being launched. Bucket-Braking sort of thing. But only just now, right after the update, i braked right before the blast zone, but still got KO'd. Sometimes before, i'd reach the blast zone and manage to shoot a Lloid Rocket a split second before getting KO'd, but this time Villager appeared in the magnifying glass until he was movable again. I don't feel, as a Villager main, they slide around when using it even now, so maybe they've been granted some invincibility or something.