I donated
I donated to the Kickstarter campaign and will post here what I learn, when I learn. Sadly, I had hoped to have the Atom before a tour this coming summer, but sourcing and manufacturing delays have put the shipment off until July.
The device can be used on the non-disc side of the front wheel provided there's ?20mm of space between the front dropout and the hub flange.
The decision to use a battery was, I believe, driven in part by doners wishes, as is the fact that there will be 2 USB ports. I suppose the reasoning is sound enough; to allow charging while stopped.
Mounting on the rear of any Cruzbike is a no-brainer.
Chris