Mightygrey
Headphoneus Supremus
I'm putting my money on open-back + planar. They look like very large ear-cups, potentially to house the the large surface-area of a planar driver. Also looks like a rod adjustment as opposed to system on the 99's.I'm not sure how accurate it is, but their Wikipedia page talks about releasing an IEM, on-ear, and two open-back headphones. Can't wait to see what comes of all of this.
https://en.wikipedia.org/wiki/Meze_Headphones