It would be really cool to see another version with smaller electronics, flex PCB, etc.
Other features, like connection to a smart phone for waypoint navigation would be neat.
Having everything integrated into a baseball cap makes the most sense.
This could easily be a Fitbit type device on wrist.
The key components are a compass and motors, and since 2009 those have been dramatically miniaturized, thanks to the smartphone industry. Combine that with flex PCB and I bet you could fit everything in the form factor of a slap bracelet.