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
According 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).