I'm not here to argue, and I'm not going to turn this into a flame war, so I'm going to say my piece and that's that.
I can't get behind the rounded corners thing. Some of the things Lucas changed you wouldn't notice until someone pointed them out, but that doesn't make them right.
Strictly speaking, it moves the project from a preservation to an edit. That's just how it is. The change is intended not to preserve the look or feel of the original film, but instead it's willingly cropping out picture information to alter the feel of the film to the editor's liking. This is no different than Lucas willingly cutting out (or covering up, as the case may be) picture information, however tiny and "inconsequential", to insert some 3D dinosaur or what have you. The argument that we can just "crop them out" after the fact is even worse, as it requires the loss of even more picture information, which is unacceptable.
We only just regained the uncropped scenes of the Millennium Falcon from Empire, and the fact that a community that was elated to see that regained picture information now think it's suddenly acceptable for a fan editor to turn around and cut out further picture information, however small, is absolutely ludicrous (not to mention a double standard). I think we can all agree that the picture information lost in the 'Falcon scenes was not a "major" change, but was no less egregious than the revised Mos Eisley entrance.
I acknowledge that the change is a very small one, but it is not inconsequential; it completely flies in the face of a preservation effort when you make a change other than one to preserve the film, especially if that change is intended to alter the viewer's perception of the film.
I love Harmy's work and appreciate his hard work and incalculable contributions to the Star Wars preservation effort as much as the next person, but if this change makes it to the release version, this project can no longer be considered a preservation, unfortunately, and the topic should be moved to the Fan Edit section of the site.