2048 doesn't seem like a far fetched date no more...

[Xpand]

Aerofex Hoverbike
video:
http://www.youtube.com/watch?v=-A4ut_4fG6A

A bit of reading:
http://geeksmash.com/science-technology/science-technology-news/8aerofex-hover-bike-star-wars-speeder-bike22/

It isn't exactly anti-gravity per say. It's actually a VTOL vehicle, that uses ducted fans to "hover". It wouldn't survive the winding corners and jumps of a wipeout styled track.

Can't wait to get my hands on this tecnology and make it go faster. I still have to work a lot to even start doing anything though...

[docfo4r]

Looks interesting. The fans must have immense power to create a cushion of air underneath the construction since there is nothing around holding the air in place.

[Xpand]

It's more about how you channel the airflow through the ducts than how many horsepower you have. If you have a very good duct cross section you can get almost 4 times the thrust with half the power. It's all about the Bernoulli principle.