Updated with OC server moves as well.
We have some unannounced free character moves coming tomorrow, from many high pop US servers! You can check out our latest population report to see more details on all realm populations right here.
OC Servers (source)
I have updated the OP above. These free character moves will also be available:
Server Transfers (source)
Starting at 11:00 a.m. PDT (2:00 p.m. EDT) on Wednesday, Sept. 11, we will open the following free character moves to offer you a way to move your characters from the most high-population realms that have extended queues:
We expect these free character moves to remain open until 11:00 a.m. PDT (2:00 a.m. EDT) on Monday, September 16. Please note that restrictions apply:
A character cannot move if the character:
is a guild leader.
has active auction listings or bids.
You may be required to change your character’s name once you’ve reached the destination realm.
You cannot move a character to a PvP realm where you already have a character belonging to the opposing faction.
This is a one-way, irreversible move. Blizzard Customer Support cannot monitor or modify a free character move.
During periods of high usage, free character moves may take up to several hours to complete. This service may be closed at any time, without warning, should a destination realm become full. We strongly encourage players who wish to use this service, especially in coordinated groups, to do so as soon as possible.