According to Kotaku, Destiny's next expansion, House of Wolves, will be released May 19th. 
This is a highly anticipated DLC for Bungie, as the last Crota DLC took huge backlash from long time fans as gear was rendered worthless and new players were getting better gear with minimal effort.
This comes after Bungie's 1.1.2 tweaks to raids, strikes, and pvp modes. Little is known about House of Wolves, but expect much more detail in the coming days.
 Kotaku - Destiny's House of Wolves Comes out May 19th - http://kotaku.com/destinys-house-of-wolves-comes-out-may-19-1697466230