Theres a trailer out for Dirge of Cerberus (part of the Final Fantasy VII compilation) from jump Festa 06 showing Lucrecia, vince in his monster mode some one eyed girl and some other characters. Seems like most of the FVII cast will be in this, from Reeve to Hojo.
Link to video:Translation of opening dialog
Yuffie: Finished on this end. What about you?
Vincent: Done. But, Yuffie. Take a look at the Mako cannon.
Yuffie: There's nothing really... huh, what?
Vincent: Thought so.
Yuffie: W-wait! This isn't right! This shouldn't be possible. There's no way anyone could be up there, not like this!
Vincent: Yuffie, you go on ahead back to Cloud and others. Looks like I've still got work to do here.
Yuffie: Ho-hold on! Vincent... This looks bad. Get back here!
Vincent: Hm, I guess there's no way around it. Let's save the world. (or "let's try to save the world")
Also it seems like this is the second music video to Gackt's song Redemption.