Bumping this thread to tell you all that NCircle will be releasing the film on Blu-ray/DVD combo pack:
https://www.amazon.com/Gumby-Movie-BD-Combo/dp/B01M9BFWNM mario gamesAccording to the runtime, it seems it will be the theatrical version.
Further confirmation comes from a listing on Amazon Instant (with NCircle listed at the Studio) with a runtime of 88:36 (it still missing the Warner Vision logo though).
Even though the length of the version I’m watching on Amazon Prime is the same, I’ve already realized that one scene is still missing! When everyone first gets to the barn and Gumby’s band gets set up before their first performance. It goes right from the end of the scene where the group decides to put on benefit shows to the jam!