Ive been sort of unofficially researching this topic too but I feel it may be too soon. As far as I know they arent even being advertised yet. You have to contact Dax direct. Also it sounds as if an in frame kit is a loooonng way off. Im sure a friction drive will b available sooner, even though 85% of the people who buy bike motors want the in frame kit.
Your best bet is to contact him direct, buy one off him (if he has any ready to be shipped), then buy a china girl kit and just sell the motor and use everything else.