As promised earlier this week
has deployed update 3.1, adding a new shared fast-track server to help speed up the leveling process by allowing players to take advantage of double XP and Rift buffs. In addition to leveling getting a whole lot faster, players will also find new events, more features, reduced instance level requirements and more.
You can read the lengthy list of 3.1 patch notes for all the latest changes.
Source: Aion 3.1 Launch Announcement