I saw a similar helmet at one of the shops last week. It had a clear visor, and on the outside had a dark smoke half visor. Looks like it would only the upper half of the face.
The one you pictured looks better than the one I saw.
Good idea for riding during the day then into the night.
Is a cool idea. I've never seen a bike helmet made that way. It would certainly help on those mornings that I end up being at work until well after sun up and didn't bring any shades. Or those evenings when the sun is going down and I'm wondering where to put them and not get them scratched all to hell or broken.