Mission is a powertrain company who happens to have built a motorcycle test application, among other things. I'm not sure they qualify - and if they do, they're certainly not targeting affordable mainstream designs .. but their technology is top-tier.
Zero is IMO the only company that is presently selling a current-generation bike (NMC or other > LiFE battery tech, AC motor, regen-capable controller).
SMRE has developed the IET and motor, Brammo just has to integrate it. Brammo has talked up the Digital Power batteries some; I suspect they design and manufacturer the modules, but the cells are likely from China or Korea.
BRD, Brammo, Agility, et al are shipping relatively affordable current-gen bikes in the next several months.
BMW, KTM, Honda have all built or are building concept electric two wheel vehicles. Some of them are even being built in moderate quantities. To date these have just been diversions and engineering exercises .. but they're positioning themselves to move quickly if they deem the market is ready.
I pick Mission Motors for the most advanced motorcycle-related tech. As long as cost is no object.
The question of whether advanced technology will get cost-engineered into affordability or whether more.. pedestrian technology will pick up whiz-bang features with time.. well, let's find out : )