He was asked in an interview not too long ago if he'd recommend to Apple that they get into the car business, and he said, "Yes, they should!" Odd response if he's expecting competition. I think an acquisition is much more likely, and it would also fall under the explanation of "we need a ton of money". I.e. we agreed to get bought by Apple because of their massive cash engine and operational expertise.
Said he would need massive amounts of cash soon. Maybe he knew what's going on with Apple.
Or just that he needs money for the battery factory.