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OTP existed at least this time last year
http://cyclingtips.com/2015/04/hidden-motors-for-road-bikes-exist-heres-how-they-work/ -
There are production kits out there
I think we're all missing the really important point here - When can I buy one? CS7 won't know what hit it.
Edit: Come to think of it, unless there's a conspiracy involving a major manufacturer this must have been cobbled together from standard parts/shed fettling.