Jokes on you CS was BB2, CP is BB3
All new backgrounds, all new songs*remixed*, Guard system completely changed now some moves just cause guard crush no more guard meter break meter, Combos in general are higher damage/shorter, hold button recovery from P4A added, 4 new characters, new moves, hit pause delay shortened to speed the game up, and so on.
I doubt they will ever get rid of double tap to dash it's a staple of arcsys fighters, and its not a big deal because they are well runs and air dashes *air dash you can cheat and fuse it with your jump input anyways* Where stuff like marvel you have to tap down with the dash to get distance off it.