no... the unit isn't in portrait... That's TWO pieces sitting there, the top and the bottom flipped over and both clearly in landscape as usual... not sure what you are talking about or if the photo is blurry or something on your screen maybe?
Either way, it's just normal landscape. Sad though.
and to aaalex and others - it's different. The battery of the bottom piece is clearly going to be in a different place, and the top has more slanted edges closer to those of the MBA - probably giving it a thinner appearance. It's minor, but big as far as design goes and what we could possibly see on the other side.