When I think about it, over the last half-dozen years that I've been riding e-bikes and observing the space diligently, I have seen a lot of e-bike models and brands come and go. And honestly given how much I think is possible I have seen precious little innovation in this space. Even basic technical improvements on batteries and motors have came at a glacially slow pace.
Most of the "innovation" I have seen have been variants on the marketing and sales channel and have precious little to do with the bicycle or, bluntly, the rider.
A few things that I think could be Big Deals (some I've mentioned in the past) and I offer them free of charge to anyone with the gumption to make them all work are:
1. "Pairing" chargers, batteries, and bike motors. I envision a system there all three of these things have serial numbers and you need to use software of some kind to make them work together. The intention is that if someone's bike is stolen that bike will need to be charged eventually. If set up properly you could make it somewhere between hideously difficult and hopelessly impossible to get any value from a stolen e-bike or battery.
2. Built-to-order bikes. Ideally you would have an online bike fit which would choose a bike of the right size for the purchaser. Or you could have a simpler system where at ordering time the purchaser submits their height, weight, and a photo. Then the builder chooses the right frame size (or perhaps a custom-built frame) with the right stem height and saddle height. Given that (I think) the average e-bike is ridden further and longer than the average acoustic bike, this would provide huge improvements in bike comfort.
3. Steel is real. In 2019 there were rumblings of newer process for making steel tubes suitable for bike frames. The potential seemed to be for less expensive, lighter, and stronger steel bike frames. Last I heard (early 2020) was that they were inking deals to build factories in Eastern Europe. Since then, crickets. This could also tie nicely into the previous idea since it would be easier to build custom bike frames at scale around steel.
4. Light weight e-bikes. A lot of folks argue that with an electric "weight doesn't matter". Well, they are correct until they need to take the bike up or down flights of stairs, load it onto a bike rack, or carry it on a train or bus with a weight limitation. And then weight can matter a heck of a lot.
5. Battery share, not bike share.
6. A Universal Display Unit.