Theres been rumors that northrend might be in another expansion but I found a possible (but unconfirmed) map of northrend.I dunno if its real or not post what you think http://www.wowwiki.com/images/e/ed/NorthrendInGame.jpg
Oh and I dunno If I posted this in the wrong section or not....so....
Edit:also its rumored that blizz will release it in a new expansion at blizzcon August 3rd