At SPEZI 2013 I test rode a Birdy ebike. Likely R&M since it's in Germany. Anyway, if this is something they were considering as a product, then it appears they gave up on the idea. It was using a Nuvinci gear hub, a front motor hub, and a battery pack on the handlepost. Bolt-on solutions that don't require any changes to the frame. While the Pacific e-Birdy seems to be a singlespeed with a rear hub motor, batteries inside the hub. Neither are really good ebike solutions. To achieve that the frame must be designed for it.