So, how do you think, or hope, is going to portray Elsa?

Well it seems like they're going to make her the villain, which I personally, don't like. I LOVE Elsa and I'd rather see her as a "Frozen" self than a nasty woman. I hope they give us a reasonable backstory for her, to sympathize for her.

I'm thinking Rumple trapped her because of her powers like a trophy and now that she's out she'll want revenge on him.

even though you meant "who" i'll share both a "who" and "how" i'd like to see Elsa portrayed as. I think maybe i'd like to see either Anne Hathaway, Amanda Seyfried, Kate Hudson, LeAnn Rimes (yes she acts along with sings), or one of the Olson twins to portray her. I think I'd be most happy if either Kate or Anne played her. I've always wanted to see them both play a villain lol. Now as for how i'd like to see her portrayed as. I actually like the idea of her being a villain but I want her backstory on how she became one to be really heartbreaking and intense and not just "oh my sister got everything and i got nothing" and all that crap. lol. I want her to have redeeming qualities like Regina. Maybe have them be related somehow like long distant cousins or something. I think like how Regina has Henry, Elsa's light in her heart is her sister, Anna.