CatBus said:
When it comes to the preview versions, never say never. Harmy surprised us all by having Vader shoot at Han first in Empire Strikes Back.
Although I suspect when it comes to fooling around, he'll stick to fooling around with footage that doesn't need to have its despecialization reviewed. So, you know, maybe the Rancor will get CGI blinking eyelids, or something.
Or every single character replaced with Hayden Christensen because, hey, you never know.