They are not in open beta in Korea. Official Korean site (
http://www.ncsoft.com/kor/ncgames/aion_intro.asp) says the same as English site (
http://www.ncsoft.com/eng/ncgames/aion_intro.asp), according to google translation. The NCsoft statement is pre-E3, so my guess is they are not at schedule. Game is running late.
I expect a beta (open/close) in January/February.