Cavernous Maw, the way to the past?

Amidst the sudden flurry of new information on the Wings of the Goddess release, there is this little thing that I saw on the Wings of the Goddess site.

It's this thing called a Cavernous Maw.

Cavernous Maw

What lies beyond these mysterious portals of grotesque design, and why have they suddenly manifested across Vana'diel? Perhaps the answer lies in rumours which state similar gates were also witnessed during the Crystal War, two decades past.

Maybe this is how we will be going to the past... if we are indeed gonna go back to the past.

More Dancer information listed! I'm glad cos I was hoping they'd add this job!