I'd kill to see any of these:
*Spider-Man 3 - Over-3-Hours Pre-Reshoots Cut: I have the official novelization and every time I read it, it makes me wish even more for the release of the on-screen version of what the movie originally was. Apart from having a lot of deleted/alternate scenes, it also had some scenes that were swapped for the theatrical in a different place than they originally were in. Other than the novelization, the recent-ish Editor's Cut, being an earlier cut, somewhat gives us an idea by having scenes in their intended place and some previously unreleased deleted/alternate scenes, but it still had the reshoot scenes from the final film, minus some that were missing.
While I liked the final film, it's undeniable that it having to develop 3 villains and other stuff in only 2 hours hurt the movie. I think by releasing the original cut they would give the movie its redemption and would fix it by giving all the characters the screentime they deserve and improve the pacing. I would love to see all the scenes with Dr. Wallce (played by Adrian Lester), the original construction site fights, and the Venom death with Eddie's skeleton. And I wouldn't mind scenes like May visiting Peter or Mr. Ditkovich's "You're a good woman" missing knowing they weren't originally part of the story.
*The Amazing Spider-Man 2 - Marc Webb's Longer Pre-Reshoots Cut: Saying that the final film is a mess is like saying the sky is blue and that water is wet. I liked the first TASM just fine despite its problems and was hoping to see more like it, but of course, now we know that Sony ruined Marc Webb's vision.
I want to see, amongst other things, the scenes with Peter and Harry, the scenes with Mary Jane, the Peter vs. Green Goblin fight after Gwen's death, and, obviously, the absence of the Sony-shoved Sinister Six teases (with us having MCU Spider-Man today, who cares about that stuff missing?).
*Batman Forever - Joel Schumacher's Original, Darker 170min Cut: This was not one of my favorite Batman movies growing up, but now I appreciate it a lot and actually like it.
To honor him, they should release the version of this movie that Schumacher originally made before it was ordered for a lot of scenes to be deleted and others to be re-done so the film would be more family-friendly.