Maybe it's a trap. Think about it... they let us know about this one ahead of time. Their is surely going to be at least one boss and probably a rather nasty surprise at the end as well before you actually get in the vault. Heck, it may even be a timed entry thing. I can think of a couple dozen ways that the dev's could be trolling us with this. They could even pull a Tal Rasha's tomb with only the option to pick one and the rest disappear into the sands.