AION: The Tower of Eternity is still under development by NCsoft, and any information related to the game is subject to change with the release of more information.

At this point, there is no officially estimated release date for Aion.

Rockjaw on the release date (12-18-2006):

"If we all cross our fingers, hold hands and believe in fairies hopefully Aion will be out inside a year or so. If in a year or so's time the game isn't released, though, please don't all rise up and kill me. A more precise date I won't give out, either... even if you torture me."

As you can see this is now a very old quote. Aion is presumed now to arrive on shelves in quarter 1 of 2009 with a US/EU beta coming our way later in 2008.