I'm seeing this on multiple sources, so it doesn't seem to be fake. Greg and Jill Henderson have built...
It's actually more like the hoverboards in Scott Westerfeld's Uglies than anything from Back To The Future - like them, it only works if there's enough metal below you.
And, right now, it only hovers about an inch off the ground. There's actually nothing that innovative about it - it works on similar lines to a maglev train.
The creators plan on building a special skate park where people can play with their boards.