After finishing all adjustments for the merger, we have decided to delay it just a bit more to perform several additional tests to ensure a smooth transition. A new ETA will be given later during the day.

In the meantime you may still connect to AT wotlk with your normal account.

Realmlist is: logon.arena-tournament.com

All servers goes down 00.00 CET.
Starting the merge to molten. 
Wotlk will be first in line and within 2 weeks we expect the cata server to be up aswell.

Make sure you merged your account to a molten account at http://arena-tournament.com/merge