Here's everything we know for sure:

1: Chocobos dodos and cobylns are being added as mounts
2: Airships are being added from cities to the each cities level 1 levecamp
3: All items are getting converted into crystals
4: There will be a new undefeatable boss added called Chuck
5: All bots will be given Mog houses
6: Yoshi P will get replaced by a turkey sandwich
7: Ifrit beanie babies will be offered for sale
8: Ice skating will be implemented
9: all regions except the black shroud will be deleted