PowerWall.

I think Elon's just throwing money and memes everywhere, to see what sticks. The Hyperloop is an interesting engineering exercise, but it'll be a boondoggle if anyone tries to to actually build one. (This isn't to minimize what he has accomplished, but he's yet to actually show he has a sustainable business model.)

It's easy to see that electric transportation and distributed power is the future, but "first movers" are rarely the ones that win (look at Apple). "The exception proves the rule" though...

Cheers,
Scott.