In addition to having new boats, the patch features a new dungeon known as Svartvann as well as the new Darkbrood family, infesting Svartvann as well as Aldan Enak and Grivendale. There are also some noteworthy changes to Primalist spell functionality as well as a new skill meant to disable perpetual blocking. And you can have a new ship module if you can't get enough of aquatic antics. If none of the above strikes your fancy, you can at least enjoy the requisite bug fixes and UI updates that should make the game more fun to play for everyone.
[Thanks to LanMandragon for the tip!]