Chilton details the upcoming Transmogrification system, which allows players to customize the appearance of their gear by transferring one item's graphic to another. He also discusses the new Void Storage system, which grants increased storage space, with the caveat that any item stored in the void will be stripped of all gems and enchantments.
The pièce de résistance of the whole affair is, of course, the final showdown with Deathwing himself. Players will have to traverse three separate five-man instances, which will culminate in a huge battle that doesn't just feature Deathwing as the opponent: He's the battlefield as well.
But we don't want to give it all away, so head on over to Joystiq for the full, juicy interview.