Darth Lucas said:

So, I can't necessarily state my sources other than saying that it is from a reputable source within disney. But, I happen to know the attitude at disney towards all things prequel and special edition is very negative and have heard that restoring the original, unaltered trilogy is a priority on the Star Wars front, though their focus is mainly on TFA, the spinoff films, and rebels at the moment and it is unclear when we will see a release, but that it is going to happen within the next couple of years.

If that's true then maybe after TFA and the new trilogy hype slows down they'll work on it more.