At Aero 2014, a German company called E-volo drew lots of attention with its unique Volocopter, a multiple rotor electric helicopter design that flew unmanned last fall. The next step is to improve battery capacity and perhaps design a hybrid version.
This is a companion discussion topic for the original entry at https://www.avweb.com/air-shows-events/video-volocopter-debuts-at-aero-2014