I'm not sure how much there is to get excited about this, honestly. The "Complete Atlantic Records Catalog" is not everything. I know most people are in it for the 70's stuff, which is all included, but as Stadler said, the Steven Wilson versions are widely considered the definitive versions of those albums and I honestly don't see how they can be improved upon. The multitrack masters of Going for the One are conceded by many to be lost forever, so unless they turn up somehow, we're not going to see a remix/remaster/whatever of that one. For those for whom the 80's stuff is where it's at, note that 90125 and Big Generator were Atlantic, but Talk (widely considered the best of the Rabin era) is not. Keys to Ascension I and II aren't as highly revered by some as much as me, but they do have the virtue of being performed by the 70's classic lineup and I think each has some great stuff, and they're not included. I even like a lot of Open Your Eyes, which is also not included here.
So basically, the Atlantic albums are now Warner, but all the others are still whatever they were before. Okay.