I'm predicting:
-Changes to the loading area (it's closed in now, plus I'm assuming for safety issues there will be gates before you board... so it might get some re-theming)
-Painted/Updated Props (FX-1, Post Show, etc)
-Possible changes to the unloading and post-show. Not sure about this though. I would like to see it, especially the part at the end with you showing up on the TV...
-Also hoping for the orange looking poles out front of space mountain to get more of a metal "tomorrowland" feel to match the rest of the land
I'm not expecting any changes to the ride itself. A new lift system and SOME form of audio (along track or mountain-wide) would be nice, but I extremely doubt it.