We haven't seen a bunch of things... lets see...
Character:
- ZSS Final Smash
- Sonic Final Smash
- Pikachu Special Moves
- Samus Special Moves
- Bowser Special Moves
- Donkey Kong Special Moves
- Yoshi Special Moves
- Peach Special Moves
Item:
*Normal items:
- Smart bomb
- The spike ball thing
- Spring
- Lightning bolt item
- Items from previous installments 2 (?) - Fan, Star Rod, Heart Container...
*Pokéballs:
- Torchic
- Gardevoir
- Kyogre
- Latios and Latias
- Bonsly
- Pokémon from previous installments (?) - Snorlax, Electrode, Staryu...
*Assist Trophies:
- Saki from Sin and Punishment
- Advanced Wars
- Metroid
- Jill from Drill Dozer
The (?) means I'm unsure if they'll happen... Actually, I'm pretty sure that NOT EVERYTHING in here will be updated on the Dojo by the Japanese release date... However, this is just an extensive list of what's missing. 21 updates... 23 if you count the (?) ones.
Wow, that's a lot.