Make of this what you may but i was just browsing around and on musicweek.com there is a playlist of what they're listening to and top of the list is Coldplay "Square One"
if you go here :
http://www.musicweek.com/title.asp
and look on the right of the screen it's there! Does this mean promo copies have already been sent out to radio stations, mags and stuff. If the album might not be coming for a while i suppose they've decided to release the single a bit before the album comes out like they did with "In my place". This is all just speculation but it can;t be a bad thing that sites are starting to talk about the new album/singles shame i can't listen to it though!