The curse that bound Midna to her "imp" form was broken at the end of Twilight Princess.
^ Well, yeah, you shouldn't expect it, but one of the top staff (I think Miyamoto himself, but I'm not sure) did say that, if enough people ask for her return, Nintendo will oblige. In which case, she'll likely return in one of the other two timelines. I actually thought up an idea for a game where she appears in New Hyrule, along with Majora's mask, and plays the role of the (unwilling) villan. But yeah, Midna still is in limbo in terms of a reappearance, and leaning toward a no. 00:07, December 23, 2012 (UTC)
At the moment, no. No confirmation of any kind. Personally I hope she doesn't return. I'm tired of game developers catering too much to the fanbases. It's their story, the fans should let them tell it instead of interfering and asking them to do ridiculous things that wouldn't make sense in the long run (not saying that it couldn't be done and not make sense canonically, but my point still stands).06:01, December 23, 2012 (UTC)