So last night I decided to pay a visit to the Citadel and walk through it. The structure itself is very linear up until you reach a giant blue beam of light across a small bridge. The area is only guarded by level 22 vex, and when you walk up to the blue beam it has a shield ALL the way around it that keeps you from entering. If you look up, you see that the beam pulses in an upward motion, and goes to the very top of the Vex Citadel. Most likely an elevator? Anyways, I hope it's a free content update later, as I hate paying for on disc DLC (even though I already have the expansion pass). Edit: This thread is super old, let it die again.