Well apparently it can run over lots of diffrent surfaces. Concrete/ asphelt would be best but the vid shows it on dirt aswell, Axon put a thread over at RCgroups.com and said that it will be able to go over snow, ice and Water if you waterproof the electrics, anyhow i will pop axon an email as i too am interested if it can run over grass.
According to the site it wont be in stock till october 1st[:@] saving time tho i guess.
Anyhow i managed to find some specs on the Base Vehicle:
The Axon Razorback model is the first Anti-Gravity Racer RC vehicle. Similar to a hovercraft but designed for speed, the futuristic RC vehicle can do speeds of 25mph right out of the box, with a motor upgrade to 50mph. Works best on pavement, sand, indoor tracks and other smooth surfaces.
3 Channel 2.4ghz surface radio
Re-chargeable 3 Cell 1800mah 25c Lipo Battery Pack
approx 8 Minutes run time
Dual Brushless Motors
Lexan Body and Pplyethylene foam bottom make it nearly undestructable
Comes fully assembled
Hood: Lexan/Fiberglass Mesh
Base: Polyethylene Foam
Skid: Polyethylene Foam/Styrene
Power System: 55mm Ducted Fan 4000kv
Lift System: 55mm Ducted fan
Steering: Rudder with Sub Micro 4 Gram Servo
Weight: 17oz including lipo
Black, Silver, White, Red, or Blue.
And more Pics