It has recently come to light through a series of Tweets that Modest Mouse is working with Outkast member Big Boi, and producer Chris Carmouche on their new album.
Big Boi has been tweeting:
Me and @mouche1 in the studio workin with Modest Mouse on their new album Turnt up ! Shout out to Issac and the crew! (Apr 25)
Been camped out in the Lab with Modest Mouse all week, workin on the new mouse LP, coolest cats ever. Long Live The Funk (Apr 27)
While there is no official word on if Big Boi is producing, or perhaps providing vocals for the album, it is the first official confirmation that Modest Mouse is indeed working on a new album.
In other news, February's earlier rumour, of Modest Mouse working on a Buddy Holly cover, seems to have turned out to be true.
Modest Mouse will be covering "That'll Be the Day" on an upcoming tribute album entitled Rave On Buddy Holly, out June 28.