It's called "Survival" and will be played a lot through all the offical coverage.
The track will have its debut on BBC Radio 1 today and be on sale through iTunes tomorrow.
(Thanks to Jean-Francois for the tip.)
It's been rush-released for today. Should be all over the radio and the Net by now. Muse continues their gradual transformation into The New Queen. Not that this is a bad thing, mind...
Oh, look! Here it is. (Thanks for the link, dude.)