According to the fansite (which apparently follows the band very closely), also noted that Coldplay's Chris Martin was also there. It is unclear if Martin is contributing to the album or if he was just hanging out.
Danger Mouse is producing the album. He has produced The Black Keys, Beck, and Norah Jones. Danger Mouse is also half of Gnarls Barkley.
Bassist Adam Clayton recently said, "We very much want to have a record out by the end of the year, September, October, November; that kind of time."