Great find... I am not sure what GM is up to yet with this, will have to wait to see the product.I found this recent patent from GM showing a stowable tonneau cover for trucks:
Is this what they are going to use for the Hummer? I haven’t seen anything yet regarding this cool feature that I believe is still supposed to come with the truck. But from the drawings you may to forego the Multipro tailgate due to the way it winds up into the tailgate. Could be wrong here, but it looks pretty clever.