Jonathan LeCraft, Senior Game Designer at Blizzard has recently confirmed that Demon Hunters will be released on live severs on August 9th, albeit in a restricted form (since only 2 of their 7 talent tiers will be available).

Demon Hunters will have two specs, Havoc (melee DPS) and Vengeance (tank). As most players probably already know, Demon Hunters will use Leather and have Agility as their primary stat.

(original post: http://www.icy-veins.com/forums/topic/22138-wow-demon-hunters-to-launch-august-9th)