Seen below is Power Rangers SPD's Uniforce Cycle. An inventor finally truns it into reality. see below.
Speed is controlled by how far you lean forward, with the gyros relaying the information to the ECU (electronic control unit) hooked up to the motor. Futuristic indeed but a one-off for now.
Click this Gizmodo link to read more of the article.
Also check out this cool enclosed motorcycle.
Thanks to Watchermark of Rangerboard for pointing it out.