Flywheel
Williams have developed a flywheel system. Energy stored in a rotating mass!! Brilliant!
Whilst the other teams have gone and more or less successfully deployed a battery storage solution, I really want to see the Williams system. It's clearly got to be aligned with the a vertical axis - otherwise it wouldn't turn at all: but how does it affect handling? It should provide a whole new level of vehicle stabililty due to gyro effects, a huge amount of torque to resist yaw and pitch. If they can find how to blend that into the car balance, it would be startling. I guess there are "issues"...shame, bout time williams rose again with some killer tech.
I have long speculated on a flywheel-equipped bicycyle...