While the devices are now close to shipping, the UI associated with these have always been kept under wraps. These wraps have now been lifted, and the results do not really live up to the hype, as little as there have been.
The interface, called Odyssey, seems to be very similar to TouchFlo version 1, but does even less. On the today screen is a weather forecast which can find your nearest city by GPS. That appears to be all the today screen plug-in does.
Twinned with this is a Taskbar application, which brings up 4 customizable shortcuts, which seems to be a more limited version of TouchFlo as found on the HTC Touch. It can be activated by a dedicated button press, or TouchFlo-like with a swipe from the bottom of the screen.
The one useful feature Velocity has developed is VOTA (Velocity Over The Air), which allows for automatic updates via direct download. Hopefully it can be used to beef up the functionality of this extremely limited interface add-on.
See the Velocity Mobile Interface Demo here.