I remember a big fuss about direct injection a few years ago, but then it all went quiet. I thought that, despite better economy and emissions, it made less power than equivalent engines -but maybe I dreamt it
Some interesting background is at
wikipedia
I agree with EE3racing -there's only so much gas in the ground and one day we'll have to find something new.
I love gas engines though, so hopefully stuff like this will push that day off a bit..