Personally I'm really curious about the songlist. We have each character's 'signature' song confirmed, and four new playable songs (2nd Mix, Megare, The World is All One, Little Match Girl). As Smoky Thrill/Alice or Guilty are event-only I don't think they should really be counted, and that leaves us with 13 confirmed playable songs which seems a little... small? I know it's more than Arcade had, but it's a noticable even if not majorly earth-shattering drop compared to the previous game and SP.
I'm wondering if the other 9 Arcade songs are shoe-ins, as none of them have been confirmed to be signature songs or anything (all the signature songs are 360 additions or from the CDs) which makes me think they might just all be in. Otherwise I figure at least one of them would have been confirmed to be actively in, if it was selective?
Else... entirely new songs to make up the 'base' roster? Could be fun to see.