There has been rampant speculation as to when World of Warcraft: Warlords of Draenor will be coming out -- and all of it is just that, speculation. We have very little evidence of anything being said by anyone. However, there have been some off the cuff remarks dropped here and there.
One such remark was made by Ghostcrawler tonight. He compared the development state of Warlords of Draenor to that of Mists of Pandaria. Put simply, he feels that they're further along in Warlord's design and development than they were in Mists at this time.
Take that for what you will, or won't. Don't read into Ghostcrawler's tea leaves too much, or he'll start posting this picture on Twitter.