Many rumors are flying, but I can tell you from first hand experience it does get "stuck" a lot. There are many times people are evacuated and that just isn't good from a guest experience standpoint or for safety. We were stuck on the same ride in California for well over 10 minutes and I can tell you it's quite bad on the nerves! Alex was scared to death and cried the entire time we were on there. He wouldn't ride it for a long time after that and didn't ride it in California again, only recently in Florida and after a lot of coaxing to get on!
So if you are traveling during this May 11 - September 25, 2015 period you will miss this awesome classic. I don't think much will change in the interior hopefully just an update of technology. Anytime Disney messes with a classic us old timers get a little unsettled and they quite frankly don't like it. Keep your ears open and let us know what you hear!