I hope they add some Roger Rabbit themed ride(s), but please don't make it a copy of Disneyland's. Not unless they work the recent bugs out of it. Since the accident with the little boy and the renovation that followed, this ride breaks down multiple times daily. The last four times I've been to DL, I have yet to successfully ride Roger Rabbit Cartoon Spin. It's either temporarily closed, or you get in line and the whole things stops.
I've been told that the new guidelines for the ride make it go into complete shutdown if anything--as in any car--seem slightly off.
As far as the ride itself goes, back before the rehab, it was one of the best on property.
I personally don't think Cartoon Spin is coming to MGM, especially since reports are coming in that the Mad Tea Party at DL no longer allows guests to spin the cups.
Last thoughts, a family friendly ride or two added to MGM would be nice.