I'm hearing RUMORS, too:
[spoiler]-Six extra characters: 95 Rival Team [Billy, Iori 95 (no 98), Eiji] + Kyo 98 (still Hero Team), Saiki (¿alone?), someone else (¿Botan?+Saiki and Ash = Ash team?)
-Some changes for 2 teams in Story mode[/spoiler]
of course, are only rumors, and not sure from where are coming