We got a bit of new info about some of the extras and game related stuff for the game.

Here's a quick rundown of the new stuff revealed:
New characters will be from the SNES era and up. *sniff* I wanted Leon...

Kefka and Shantotto have joined Firion as being some of the characters whose battle styles are being reworked for the game.

Dissidia 1's story mode is an unlockable extra and is being remade to go with Dissidia 2's map system.

The chessboard system still exists as the games "dungeons" and is apparently being reworked to make it more fun.

Laguna Lorie was originally meant to be in KH:BbS but was removed from the game and reworked for Dissidia 2 instead.

The map system was suppose to be in Dissidia 1 but was never implemented cause the idea came late in development.
editga: Someone got a chance to play through most of the cast and wrote down some move set changes.