I think the 2 rear seats are a waste.
I mean why buy a car so small to carry 4 people?
If the goal is to save gas with a compact light-weight platform, why would I kill that with 4 people in the car?
And being a 2-door, it's just a hassle to put people back there.
Nevermind the rear-crash safety issue that you guys have brought up.
Why have a hatch in the back? Unless the two rear seats fold down to create some sort of cargo space.
But then again I ask, why even bother with the 2 rear seats ?

I don't know.
It looks more like a copy-cat attempt to get their piece of the market share and jump on the "rising fuel cost - mpg - hey look at me" bandwagon.