I think its safe to say most of the original cast will make a return. I'm more interested in the two empty bars that were added under the normal Health bar. Looks like a new game play mechanic.

The game is apparently going to be playable at TGS this year so we will probably get some information about the game by the end of the month even if its nothing more than a few new game mechanics and idea of how Kain and Lightning will work.

From the screenshots, it looks like Lightning's EX Burst is going to be her using Zansetsuken (sp?) simialr to her summons ultimate attack.