This is the IPSVM skateboard, a concept design by Loren Kulesus that cuts out a good chunk of material from the deck of the board. On the plus side, it would make the board much lighter, and it looks really awesome. On the downside, something tells me that this thing would break in half after about five minutes of riding. But hey, just buy 50 of them to keep on hand!
It's the classic problem with concept designs: they look cool, but they never seem to be based in any kind of reality. But for eye candy, they really can't be beat.