On Twitter, Maggie was suggesting (when everyone was besieging her with questions about the 10th Anniversary show) that it probably won't be until this coming year. She was saying they were still trying to iron out all the details. Thinking about it in terms of performers, its probably very difficult to schedule something with the potential to bring back so many former girls. They've all got commitments and schedules to keep. Trying to find something to work for the dozen girls (is that the right number? are we up to 12?) is going to be difficult!
Lisa K also did a Q&A last weekend, and there where a lot of questions about the subject of appearing but she said no:(