This just in from the Murloc (AKA Community Manager) Fangtooth over at Blizzard's forums:

During the Tuesday weekly maintenance, we will be releasing content patch 1.6! As a reminder, Warriors and Warlocks will have had their talent points reset. Warriors and Warlocks will need to re-allocate their talent points, by accessing the Talent panel (default key “N”). For information about patch 1.6, you can read the patch notes here: http://forums.worldofwarcraft.com/thread.aspx?fn=wow-general&t=3781928&p=1