There's talk of something along the 4.8is line that would be out, but I haven't heard anything as to when, so I wouldn't expect it to be in the near future. There's also the X6 (new model) that will be sportier and more powerful, also not officially announced yet.

My guess from what people have been saying and from what I read is that both would be somewhere between $80-100K. Will be interesting to see how they'll be positioned since they may be similar in performance and price tag.