Although this is not the final release of the game and it was my first time playing SC5, I think that it will still be helpful if I post my pre-release opinion of her.
But first, if someone has the video of the NEC 12 SCV exibition of me playing Hilde vs Ramon's Pyrra, it should be posted. In this video, you will see her new style along with her strengths and weaknesses.
positives
charge moves inflict much more damage.
C2AA seemed to track 100 percent.
C2AA and her grab mix up is stronger than ever.
charge moves have more push back. this means that in the right hands, a Hilde player can spam back dashing and charge attacks.
her normal attacks are better according to Daishi's translater, Yoshi.
she can charge A+B, which is a really good move according to Daishi's translator, Yoshi.
command grab and 22b link into critical edge(CE).
her artwork and style are much more aesthetic and appealing.
i want to say that C2AA and even her charge attacks have more range.
charge moves take less time to charge. that's a huge buff.
negatives
no longer the ring out queen.
no more doom combo, however, she has other ways to get high damage.
you can't do normals or even throws while charging attacks. ouch. i even wonder if you can break throws while charging attacks.
charge attacks definitely have a small window of GI frames, if any. I couldn't GI one move with any charges during those matches.
i don't know if this goes for everyone, but Hilde's CE doesn't appear to have any start up invincibility frames. Ramon hit me out of hit every time.
you can gi/auto gi the 2nd hit of her charges. Ramon shut my charge game down completely with Pyrra's Gis by countering the 2nd hit of my C2AA/C1BB on block. i would expect another charge move that i could do to mix things up. if not, then ouch.
summary
Hilde will need to be played with more diversity with a mix of charge and normal moves.
This is because her normals are better and you no longer have an option to do moves while charging.
Hilde also hits harder now and she can zone better with the new game mechanics. I really think that these aspects are her biggest strengths now.
Her low game still seems to be weak, so her main mix up game will be a mix of throws and charge moves. That option was really strong in SC4 because of the ring out aspect, doom combo and the ability to throw while charging. However, in this game, since those aspects where taken away from Hilde, that mix up will be less effective and practical.
Also, characters with auto gis like Pyrra seem really strong against Hilde because they can block her charge moves and just respond with an auto gi for guaranteed damage without using meter, thereby essentially shutting her charge game down.