Wow, looks like April Fools came early this year.
Seriously though, they've really gone the extra mile with this. You can check their website for a seemingly legitimate Terms and Conditions, as well as a relatively believable backstory on it.
Not to mention the tons of work they've been doing on the celebrity endorsements, the constant influx of Facebook content, etc.
A part of me still has the foolish hope that this is actually real, but if not, I'll just have to poke around a little more into the subject myself.
EDIT: Whoop, nevermind, that little piece of hope just got crushed.
http://ftw.usatoday.com/2014/03/tony-hawk-is-very-sorry-he-made-everyone-believe-hoverboards-were-real/