Pre-patch build has been available for Xbox One and Windows Store for a few weeks but those versions finally got the actual day 1 patch other platforms had weeks ago.
The most common changes were the voice grunts from enemies. Galsias previously had extra grunts for taking a hit. A good amount of male enemy classes reused Signal's KO'd grunt. Garnets were previously using voices from Nora wannabees. Sugar bikers had no voices when charging up an attack. Mr Y's laugh voice samples sounded like an english gentleman yet his voice grunts are identical to day 1 patch.
Score combo Broken in a bad way, the time to extend it doesn't last long enough.
Gameplay mechanics:
I've only watched a run of SoR3 Skate because I am very familiar playing as him.
- SoR3 Characters' rolling action do not drop items pre-patched. This got altered in the patch by forcing the SoR3 cast to drop items when starting a roll.
- SoR3 Skate's star move doesn't have OTG properties on the rolling part of the attack. This was added in the day 1 patch.
Rolling is pretty rare for me to use so the addition of OTG on star move made SoR3 Skate better than before.
Level design changes.
- Stage 3: Ship segment 3 (pure 2D part), had 2 extra boxes pre-patched. Right before the 'hidden' apple. One has a knife and the other item is a cash bag. Apple is still there in day 1 patch but not knife/cash bag.
- Stage 4: Star and points barrel were originally placed right next to the entrance of the arcade (further away than day 1 patch).
Visual changes: The pit to the train station, entrance to Level 10's boss fight and Y Castle gate had "IN" as visual indicators instead of "GO".
Levels 4 and 10 had "GO" with a slightly curved arrow pointing to the next area and not a straight down arrow.
When nearly defeating Ms Y for the first time, her HP doesn't magically drop to 0 in the pre-patched build.
Any experts who main other characters should watch gameplay material from Xbox One/Windows 10 before that were uploaded online before May 18th to see pre-patched footage and see if there are any other gameplay changes to those characters.