The news was accompanied by a video in which Guild Wars 2 Game Director Colin Johanson discusses the firm's plans for the future.
2013 will see ArenaNet continue to introduce more story-driven content, partly through persistent events in specific regions of the game world.
The development team will also introduce a new achievements and rewards system, including daily achievements which will help "drive players to different areas of the world and play together".
Guild missions with certain constraints and time requirements will also be introduced, alongside a more exciting PvP system.
ArenaNet will continue to tackle security and stability issues, fix bugs, improve the new player experience and redesign boss encounters in dungeons and the open world.
Guild Wars 2's launch was marred by reports of mass phishing attempts against its community over the Labor Day weekend.
It was claimed that more than 11,000 support tickets over faux emails designed to steal user data were logged during the three-day period, although NCSoft and ArenaNet have since downplayed the figure.
> Read Digital Spy's review of 'Guild Wars 2'
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