Howling Fjord will be one of the two starting points for those entering into Northrend. The other starting zone will be the Borean Tundra. Wrath of the Lich King will raise the level cap to 80, introduce the Death Knight class, new PvP warfare, and new group and solo play.
WoWWiki has the image listed as a "player made" image. However, the image itself has been found around several other galleries on the internet, and there is no credit to the original author on the image. Additionally, the map itself closely resembles the terrain and layout of the zone that was playable at Blizzcon in 2007. We'll keep an eye on this, and other Wrath of the Lich King media that might be legit, and get you all the latest information when we know it. Stay tuned!
Update: The map is a fake, produced and propagated by user Kanaru on WoWWiki. Welcome to the World of Fakecraft.