Those are some awesome authors on this. I don't run 5e games so this will be a pass for me, but Shadow of the Demon Lord is one of my favorite games by Schwalb so I can only imagine what this book will be like.
Alternate would make a better cover IMHO. The original strikes me more as interior art for some reason.
The second Eberron cover was also pretty bad. Better than the first one they picked for sure, but it doesn't hold a torch to any of the other covers in the 5e line.
Savage Worlds get played in person, A LOT. It's one of those games that plays better in physical form that it does via VTT. I gleaned that from the Facebook posts I see showcasing miniatures and game table setups of "savages".
It's an interesting scenario. Paizo is still selling the DUNGEON magazines (the PDF's anyways) that contain the AP. So they definitely still own it, but I don't think they'd be able to republish it unless they ported it into Pathfinder.