All signs point to 2020.
The ST will have concluded and Ep9 will have been released on home media.
Disney will finally control all rights to the first six films with the exception of ANH.
The new 4K Ultra HD format will have matured, giving Lucasfilm an excuse to dip yet again on these movies.
We know there’s been a 4k remaster of the OT, so that might very well become the basis for the next release.
In the meantime, I’m done getting my hopes up. If there’s a surprise out-of-nowhere announcement that we’re getting it next Fall ahead of Ep8, so much the better, but I highly doubt it. We would’ve heard something by now.