I think the "simplest" project they could realize would be all music videos in a Blu-ray/4K Blu-ray boxset including Thriller that already has a 4k scan ready in addition to the Dolby Atmos sound.
Ghosts is also something that naturally would be a part of this, and this could really look amazing!
As far as i know all of his music videos was captured on film, making it possible to scan them to 4K, most likely producing great results including HDR grading and remixing of the sound in multichannel/Atmos sound.
I have seen many films re-released on 4K-Blu-ray with amazing results in regards to image detail but also due to HDR.
A project like this i think would have the potential to sell really well due to the fact that MJ`s videos really is the pinnacle of all music videos and really set the standard. Plus that Sony pictures, if they would be the ones that releases this, really has an amazing track record in releasing great quality 4K-Blu-ray discs of older movies.