The big feature of the patch will be the commencement of the Battle of the Landings. Players can surge forward to reinforce and protect landings in the Upper Abyss. There will be many ways to do this, depending on your playstyle; players can reinforce landings through quests, by killing world bosses, by conquering garrisons, and even by participating in an invasion into an enemy landing.
There are self-serving reasons to be part of this fight. When landings are reinforced, new quests, portals, and merchants appear for use by players.