Many thanks for those information, while I was Typing I already got the answer to my question in the precious post.
The important information (thank you TN1 for explaining it!) is someone has scanned the negative at 4K, or at least a good part of it. This will guarantee a preservation of them; even if the 1st release (and it's already a very good one) will be 25GB file, having a 4K scan Leaves the door open to a future improvement. What the user towne32 says about Disney part in the story is true, beating them on 4K could be too much. Anyhow the great news is a 4K scan of it does exist safely stored somewhere.