I've been thinking of adding a front hub motor to my Panasonic pedelec system - give it a little more oomph. Mine is a 250W crank motor but the gearing is mainly where Japan limited top speed. I went from 20 to 16 teeth rear sprocket and now it gets up to between 15-20mph.
I used to be a Disc brake only guy but experience has taught me that side or center pull V brakes are just fine for most eBikes.
eBikes shouldn't be going over 20-25 mph anyway and if they do - they're motorcycles and should be equipped accordingly with proper frame, wheels, brakes, tires, lighting, MSF training, etc.
Cool too see the big companies get into this - it's coming. Closer everyday!