Evanna Lynch (Luna Lovegood) made an appearance on The Tubridy Show where she talked about being a child actor.  In the interview she confirmed that she will be returning for Deathly Hallows and will be filming in May.  Thanks to SS we have a transrcipt, here is a segment:

You had to wait about four hours in the crowd. and it didn’t feel long at all, it was just really exciting. … They bring you into rooms. They saw everyone who was of the right age and nationality. They check your passports and everything. In fact, the girl in front of me who I was talking to, she was 13 and they just kicked her out. We went in. It was harsh at first the way they knocked people out. They’d take about 200 into a room and line about 30 up and they’d tell you to come forward and say your name and where you come from. And by that they would pick 2 or 3 people out and the rest would be, “Goodbye. Go home.” We had 1:1 auditions then and they said we want to see you again, that was on Saturday. And then the next Monday they called and said, “All right, screentest with David Yates, Daniel Radcliffe” … cameras, the whole shebang. I was a bit tazed by then. I’m still more a Harry Potter fan than an actor.

Thanks TLC.