In their recent announcement of "100 new models in the next 10 years", Harley mentioned something about the sound of an electric bike, and of course Harley knows very well how much its riders love noise. It was a short quote, hard to figure out exactly what was meant, but I got the impression they were intrigued by the sound of an electric bike and wanted to go with it and see what they could do with it.
It's an interesting thought. I've had people say the characteristic whine of my bike is a little bit like a jet, and I have to admit it's not a bad sound, very high-tech. I don't know exactly what causes it (just the magnets and stator pushing and pulling on the each other perhaps?), but it it could be emphasized instead of focusing on noise reduction, that might not be such a bad thing. There's even an electrical crackling sound I'd swear was associated with brushes arcing if I didn't know better. I love the nearly silent operation of my bike, but I can see the opposite argument. Even to me, a drag race wouldn't be half the spectacle it is without the violent and nearly explosive sound of nitro-burning engines launching.