If you have been looking for a way to try out Patch 5.0.4 and get ready for Mists of Pandaria, now is your chance!
People with inactive accounts are getting an email notifying them of a free week of game time if the offer is claimed before September 19th. Be sure to log in to Battle.net directly to avoid clicking any scam email links.
If you don't have an email in the EU, give this link a try.