Not sure if this has already been discussed elsewhere, but the first six movies open with the '94 version of the 20th Century Fox title and the 2015 version of the Lucasfilm logo, but otherwise seem identical to the 2011 release.
EDIT: ChainsawAsh beat me to it.
Reportedly not identical. People are saying it’s a whole new color grade or transfer, and so far, Star Wars/New Hope has at least one new change.