Think of it like spelunking in an ice cave... with lots of treasure.
Are you ready to delve into the icy depths of Northrend? Within the chilly northern location there are many ancient fortresses and kingdoms ready to give you their loot, if you're ready. We've gotten together the most likely instances and any information surronding them so that you can be prepared for when the expansion hits.
"Azjol-Nerub is known as the "Spider Kingdom" due to it being the home city of the Nerubians. The Nerubians are a new enemy being introduced in the expansions that are returning from Warcraft III: The Frozen Throne. They're very spiderlike and contain many connections to the faceless ones and the old gods. Think something like Ahn'Qiraj (AQ) but in a darker theme."
Read more at Ten Ton Hammer's WoW site.