Is anyone working on a hybrid system? I'd imagine having extra electric motors would help with taxi manoeuvrability, give extra boost from takeoff and could save fuel while cruising.
Yes there is a lot of development being done in the hybrid space as energy storage solutions aren't quite good enough for the longer range flights currently. One example is a VerdeGo Aero. Hybridization is also a good transition technology to all electric solutions as the electric infrastructure continues to grow.