Ok, first of all. I'm really looking forward to see the episode. I really like to see alicorn Twilight, but this might be too soon. We'll see what happens.
I think (and really, really hope) that she will continue her shenanigans in Ponyville with her friends. I mean, that's partly why I love this show.
A few people are worried that her personality will change. But I don't think it will change that much, if anything at all. Because that would suck. What if she becomes just like Celestia? Oh, Gawd! But I doubt that will happen.
Oh, man. If she really keeps her wings throughout the entire episode I'm ready to kill to see season 4. What will change? What will happen? Am I going to like or hate it? This episode can change so much. Or not change anything at all.
Oh, I'm so hyped! ^^
She looks so good in the princess dress and the "big crown thingy", as Twilight said (S2E2)