ArenaNet has plans to add more events (since more events means fewer repeats all around), build new storylines, and give players of all levels a good reason to go back and re-examine content. Some of those good reasons will come in the form of tokens for achievements (which can be traded in for stuff like ascended gear and infusions), re-imagined daily achievements (and eventually, the option to complete only a certain subset of dailies to get the reward), and more vanity items.
Guilds will be getting more love with some new types of content, due "in early 2013," which will allow members to go on missions together. Over time, that system will be expanded with new rewards, missions, and tools to strengthen the importance of guilds within the Guild Wars 2 community. World vs. World will be seeing a lot of the same tweaks as the rest of the game, with the addition of improvements to culling and the introduction of paid server transfers.
PvP will also be getting some polish. Revamped reward systems, matchmaking based on skill, the ability to observe other matches, custom arenas, and leaderboards have all been listed as part of the plan. In case that's not enough for the first half of the year, there are also plans to improve the looking for group tool, fix up the Fractals dungeon, set up leaderboards on the website, redesign world and dungeon boss encounters, continue the war on bots, and otherwise tighten up the game as we know it.
Skip below the cut to let Johanson speak for himself.