In preparation of launch NCSoft is making changes to current beta accounts. Players will be able to use the same account but will need to update their passwords to finalize the change over.

On July 29, 2009, we made
updates to our Aion
account
system, and at that same time, launched accounts ready for the live
game. If you are a current closed beta participant, you should update
your password to ready your account for the live version of Aion.

The solution is simple!

1. Log in to your href="https://secure.ncsoft.com">NCsoft Master Account.
2. Click Game Accounts.
3. Select your Aion
game account.
4. Click Change Password
link in the Actions section, and follow directions to update your
password.

If you wish, you can input the
same password as the one you used previously. If you are an Aion
closed beta tester, but created your Aion
beta account after July 29, 2009, no action is needed, as your account
is already prepared.

Once you follow these instructions, you should be ready for launch
and for a bright future in the world of Atreia. See you there!

The original announcement was made here