During the Community Event
we got a surprise from Ion Hazzikostas, namely that before we can even go
to Draenor, when patch 6.0 drops, we'll get a chance to get up close and personal with the Iron Horde as they invade Upper Blackrock Spire. This dungeon will be available as a level 100 dungeon once the expansion releases, but before that, in patch 6.0 we'll be able to run it as a level 90 dungeon to get loot that will serve us as we get ready to go to Draenor.
In addition he mentioned the world event of the Iron Horde pushing into the Blasted Lands, overwhelming the area around the Dark Portal and putting both the Horde and Alliance on the defensive. It's up to players to take the battle to the Iron Horde, push them back through the portal, and defeat the forces under Warlord Zaela in Upper Blackrock Spire.