I think I will read the first book some time soon. As it takes the print copy a few weeks to reach me, I will start with the pdf. For the time being, here is the link to page for the AP: http://paizo.com/pathfinder/adventurePath/ruinsOfAzlant
If you have a paizo account, you can download the Players Guide for free and have a look yourself.
EDIT: Just opened the file. The foreword has the following teaser:
"Longtime readers know Azlant as a lost empire, a place of marvels and might snuffed out by the cataclysmic coming of Earthfall, which plunged the world into darkness for countless centuries. The powerful empire and its advances in science and magic now lie in ruin, mostly on the floor of the Arcadian Ocean, but remnants of the continent exist to this day as proud islands—the tops of mountains and lands too stubborn to sink below the waves. Daring adventurers have uncovered some of the secrets that the Azlanti empire died clutching by dodging the elves of the Mordant Spire, who seek to keep explorers away from this region lest they tinker with dangerous magical forces beyond their understanding."
Now, there is a ton of tropes just in this short paragraph, but the "cataclysm" of the "powerful empire" with "advanced science and magic" that happened "countless centuries" ago does sound quite familiar, doesn´t it? The setup - a few islands remaining from the old empire sounds more fitting for Alphatia post-WotI indeed, but other than that, it sounds more like Blackmoor viewed in 1000 AC.