A few days ago
Blizzard registered the trademark for Warlords of Draenor in New Zealand and Australia. Tonight, the same trademark has appeared in the US and Europe
. The current speculation is that this might be the next World of Warcraft
expansion; however, there has been no official announcement from Blizzard yet.
We'll all know the truth about WoW's
next expansion this Friday at BlizzCon 2013
UPDATE: Post edited to reflect that Warlords of Draenor also just appeared on the US trademark database tonight.
To see these results for yourself, you can go search on this page
. Search the term: "tm:WARLORDS OF DRAENOR"