I thought that Lucas and Fox retained the rights to market the original trilogy. Same with Lucas and Paramount vis-avis Indy.
Fox has distribution rights, but not much else. They thought it was going to be a flop and wound up writing a very bad contract as the vast majority of the revenue skips by them completely. I’d guess they still distribution, or Disney will have to make a separate deal.
Looks like we have our answer:
http://www.hollywoodreporter.com/news/tangled-rights-could-tie-up-384541
Fox still has distribution of the first 6.