http://www.capcom.co.jp/sfxtk_en/system.html
Has pretty much everything revealed so far on the system itself.
Details for Pandora:
-Press ↓↓MP+MK simultaneously when your vitality gauge is under 25% to activate Pandora. When you activate Pandora, your partner's strength will increase exponentially.
-The power of the character who calls upon Pandora is necessary to fuel the technique. By sacrificing their vitality to Pandora, their partner will be able to enter Pandora mode.
-Pandora is a system with a built-in time limit. In Pandora mode, the Cross Gauge will be filled to maximum capacity, and you will be able to use EX and Super Arts infinitely. However, if you are not able to defeat your opponent within the time limit, you will automatically be knocked out. Be careful when you use this technique!
I mean...Apparently from streamplay, blocking this is supposedly more than possible, and the person just dies, at least there's a draw back to using it (unlike with Ultras and Xfactor where the only drawback is that you used it up) Still, seems a liiiiiiiittle broken what with the unlimited stuff. I bet grapplers will love this. Get outta the way folks, PANDORA KING HAS ENTERED THE RING
Also, I didn't realize that the game had a universal magic series, though I imagined that it did from the get go, so...
Also, also, thanks Etwist!
EDIT: Lol, I just realized on the page, the pandora symbol is a big X when you activate, god damnit capcom