I guess Apple is now rich enough that they could buy one of the small players, like say Ferrari, who already have hybrid technology. Heck, they could probably buy the whole FIAT/Chrysler group out of petty cash.
Edit to add: Apple worth $700B (http://www.imore.com/apples-market-c...ook-became-ceo), whole FCA group worth $9.2B (http://www.reuters.com/article/2014/...0HS1F120141003)