Here's what I said earlier in the 4K thread:
I wouldn't bet on a new version of the SE. There are so many reasons why not. Let's first of all remember that none of the directors of the OT are in the picture any more, and usually when there's a new cut of a movie for home video they're involved. So who would be making the changes? What would be their goal? Would they get rid of some earlier changes? Let's not forget now that the people in charge now probably don't care at all for the SE. And Disney/LFL is on this OT train, and they must know that real lovers of the OT prefer the OOT and hate the SE with a passion. So they'd probably think (incorrectly) that OTers would not care for and possibly complain about a new SE.

If there is a new version, it was probably already in the works before Lucas sold it all to Disney. However, Disney has altered some of its films without the consent the filmmakers who are still alive. Take "The Little Mermaid" as a recent example. The changes were minor, but still changes nonetheless. I wouldn't be surprised if Disney tweaked the Star Wars films (including the PT) here and there.