Filed September 2015... a month before Band 2 launched.
Doesn't look like it matches up with anything that would fit in a Band form factor, especially considering the leaked Band 3 was so similar to Band 2.
Could possibly be something more like the one shown in their latest Productivity Future Vision video (March 2015) - where it's a round band that can reconfigured into a flat phone-like device.
https://youtu.be/w-tFdreZB94?t=3m19s - shown from 3:20 to 3:45
If that's the case, and they actually have a working concept, that would be really cool!