I was able to spend about an hour or two in CC sorta training mode.
Here's what I can gather for C-Ryougi.
2C hitbox is LOWER, the rekka loops are harder to do, and probably more character specific.
5C clashbox changed. It still has clash, but 2A 5C meaty didn't clash against wakeup heat. it was either that, or the input delay messing me up, but I'm pretty sure I was hitting meaty 2A 5C...
421C glitch has been removed. You get counterhit if they meaty you while trying to do this EX.
LAST ARC STILL DOES 7K FLAT. LOOOOOOOOOOOL
Custom combo 8X relaunches, so a possible hitconfirm is off of 2C 63214C 8X -> w/e custom combo you want.
You also get another rep of 6X 8X in custom combo, does about 5k+ to Nanaya off of 2A 5BB 2B 5C.
C-Ryougi is a lot of the same as before though. Nothing really changed that much. 623B slower, can't tick-arc drive anymore, 2C hitbox is lower, 2A 5C OS doesn't seem like it works anymore, though 5B clashing is still amazing.