So new features are:

1. New shell design
2. Velcro to hold body on
3. Battery with PCM (Printed Circuit Module, i.e. undervoltage, short and overcharge shutoff)
4. Upgraded battery from 50mAh to 60mAh
5. Much better QA and testing
6. Companion board works great, automatic switching between UART and Programming modes
7. Professionally glued wheels by Rob Black, wheel gluer extraordinaire