We've been wondering for a while how exactly the Ulduar storyline plays out in 3.1; this may seem a bit silly or lorelol, given how much time is going to be spent running the instance itself or its myriad of raid bosses and hard modes, but I like to know what's driving me to complete an instance beyond phatty purpz.
You can obviously infer a lot from the instance itself and the names of each respective room, but for those seeking a little more information, Wowhead's PTR page has you covered. There were a few quests added in this most recent PTR build that give us tantalizing bits of Ulduar storyline and show Blizzard's intention to create clear progressions -- not only in the 10- and 25-man versions of Ulduar, but a reward and progression path for those blazing a trail in the hard mode versions of each instance. A fine notion indeed.
Oh, and if you wanted to know just how to forge that new legendary mace...
This writeup will be spoiler-heavy! If you don't wish to know anything about the secrets that lie within Ulduar, don't click the link below. You've been warned.