A closed-back Audeze? Yes!
And, yes, it's a planar magnetic design.
Earlier tonight, I got a chance to listen to one of Audeze's closed back prototypes. Actually, these prototypes are more of a “proof of concept” at this point. As these are still in the "proof of concept" stage, only a few exist. If they do become a reality, look for a release mid next year (2013).
This headphone is a fully closed design. How does it sound? Exquisite. Surprisingly open, airy. In my initial listening session, it did not sound closed-in, the soundstage impressive.
And later today, anyone at RMAF can hear it for himself. Seriously, go hear it. Seriously.
Without a doubt, this one moves into one of the top spots on my wish list.