Since no-one else seems to have posted this, here you go
Her persona is Cinderella. The name that is being used in game, at least for the Japanese version, is Cendrillion which is the name used in a french opera based off the original folk story. That's why she's a ballet dancer or something in the trailer. I guess.
Other than that, we can see that Kasumi sucks in the batting cage. And that's all.
Update: I found one with English Subtitles
That’s a nice all out attack
Beauty is Debotion, lol
yes, i am aware that's a v.
Is her element supposed to be fire or...?