This just in from Coldplay.com:
Good afternoon. Further to yesterday's announcement of the opening acts for the upcoming UK/Irish dates, we're pleased to reveal that the main support for the tour will be Jon Hopkins (one of the principal collaborators on the Viva La Vida album). Jon will be playing at all the shows, from 29th November to 23rd December. here to check out his MySpace. Anchorman
You may remember Coldplaying reported that Jon Hopkins (one of the principal musical collaborators on the new album) supported the Brixton/Barcelona/MSG Free shows and lasalso at six shows earlier this year between 14-29 July during the first leg of the US tour.