My anticipation was answered today when my Warbonnet Traveler arrived with the two pieces of winter Warbonnet gear... the Yeti winter underquilt and the reflective liner.
The first thing I did was to shake the Winter Yeti and after a very few shakes it easily lofted to over 4.5". I took a look at the reflective liner and immediately thought that it was impressive piece of gear. I hadn't expected the reflective surface to be quite as metal-looking as it was. The liner attaches easily to the six snaps already on the Yeti, and the snaps are color coded to prevent improper attachment.
I'll be setting it up on the Traveler very soon, but in the meantime here are photos of the Winter Yeti, the reflective liner (folded to show both the reflective and nylon sides), and finally the liner attached to the Yeti (the combination also folded).
Forgive the less than perfect image quality since I used my Blackberry for the photos.