I don't think it's been done yet.
I once thought about having a thick piece of plexiglass molded with a "spine" down the middle.
But cost, and distortion while looking through the rear window using the rear view mirror made me change my mind. (Probably why Daimler/Chrysler chose not to do it as well). Always thought it looked cool on the concept car though.
I thought the wrap around windshield looked especially nice on the concept.