There are a bunch of different updates plan for Guild Wars 2 this year. This post is from Rhys, Corien, and I.
Paid Server Transfers
Guesting Enabled (finally!)
Guild Missions (you're required to do with your guild)
Dailies Requirements will be different each day
Culling WvW reduced (currently, if you see a group of players they maybe invisible until you're near them)
Watch other teams fight in PvP matches
New Rewards Achievements Rewards by using Achievement Points :D