This one should be arriving any day now.
Bilenky made a handful (Edit: only two of these frames exist) of these E-Motion 650B/29er ("B9er") frames for EWR after a customer requested a custom frame, but for whatever reason EWR decided not to do a full production run and never released them to the public. It's designed to run a 29" wheel in front and a 650b wheel in the back -- the 650B allows for shorter stays and provides greater acceleration over a 29" wheel.

