The Junk and Barque are both fairly slow warships, lined with cannons -- 12 side and one rear on the former and nine side and two on each the front and rear on the latter. To craft either, a player needs a shipbuilding mastery of 50. The new class is the Slayer, a melee warrior with skills like Battle Rage and Vampiric Strike.
Changes were also made to the village capturing and stealing mechanics to help the villages fall more in line with their envisioned purpose of being PvP hotspots. Full details on these and the other changes can be found in the patch notes.
[Thanks to Dengar for the tip!]