I was fortunate enough to grill a GMR cast member a few months ago and was able to get some relatively stable info about upcoming changes.
-After the MGM deal is over expect big scene changes to remove no longer useable MGM movies. Once you get rid of these the only really big job you have is fixing the OZ scene. Expect this to happen sometime late next year probably after the stunt show has been going for a while. As for why they took a while to clean up the show I heard it was mostly mechanical stuff, things the normal guest wouldnt notice.
-Dont expect any changes to the actual ride itself. Its gonna be the same old little nephew of Universe of Energy.