Aion's 1.9 update has been dated in a new "Letter from Aion's Producer" and will officially launch on North American and European servers on Wednesday, June 2nd, 2010. However, the release of the 1.9 update is not the only news to come out of this letter. A server merger has been announced as well with the intention of improving player numbers across the board and make finding groups and PvP combat easier.
Aion? Online: The Official Aion Fantasy MMORPG Website - PowerWiki
Aion? Online :: Notices - May Community Address: Letter from Aion?s Producer