It's called 'Born Free' and it's not what you were expecting...
M.I.A. - Born Free by TheProphetBlog
EDIT: That link has died, but here's another:
First thoughts - that Sleigh Bells collaboration is fairly obvious, but it sounds immense. Going to be HUGE.
EDIT: It now has a video (it's a bit explicit, so be careful)
Björk Discusses Scrapped Wu-Tang Collaboration
5 hours ago