@Awesmic has there been any news with Dissidia's overall modes?
The calendar-based Battle of Gods event is now in effect. It's essentially the calendar-based bonus system from the PSP games (without the abusable Groundhog Day trick), only this time you must meet certain conditions to get these rather sizable bonuses. What's more, the conditions vary depending on which faction you join. As of now, I don't know the full details on what the conditions are (and frankly, neither does anyone in the Dissidia Forums yet).
I do know this. There's another stream event coming up, so mark your calendar and keep it tuned on NicoNicoDouga in 4 days (Sept. 26). The stream begins at 8PM JST / 6AM EST.
http://live.nicovideo.jp/watch/lv275275405?ref=ser&zroute=search&keyword=DFF公式生放送&btm=r
It's probably going to cover even more balance changes and a demonstration of what Ace can do, but who knows? They might surprise us with Tifa, Noctis, or even a new stage. As far as stages go, personally I'm hopeful for Final Fantasy 4's Tower of Babil (Giant of Babil effect), Final Fantasy 2's Palemecia Castle (Cyclone effect), or Final Fantasy 8's Esthar (Lunatic Pandora effect).