No word on release date yet but my guesstimate of May/June 2014 stands.

trailer looks pretty cool.

any mention of when it will be released?

So for those not yet aware here is the trailer for the next expansion just announced on Blizzcon

And here is a link to wowhead which is collection info about this new expansion as they gather it: http://www.wowhead.com/news=223446/warlords-of-draenor-what-we-know-so-far

Here is a link to a blizz post concerning important changes to how raiding will work in the new xpac.
http://eu.battle.net/wow/en/blog/11499600