Here are some more photos I took of the unit they had on display:
http://imgur.com/gallery/5hywf/new
They wouldn't let us take any photos or video of the actual demo (though you can see a few seconds of it in TheVerge's video).
I was also mistaken about how the two panels are arranged--it's 1080x1200, not 1200x1080. The extra lines of resolution are for vertical FOV, which in retrospect made a noticeable difference. I was glancing up and down in the scenes moreso than left and right.
Thanks for watching, and I'll try to answer questions you guys have about the demo in this thread.
other things i didn't mention in the video: - the two Lighthouse base stations in the room were not on the ground, but elevated on a shelf close to the technician. I don't recall how far away they were from each other, but it wasn't the corners of the room. - seeing Atlas and GlaDOS in 1:1 scale was a real mindfuck. you don't realize how big these characters are spposed to be, relative to Chell, until you see them in actual first-person.