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It looks like U2 fans will have to wait a little longer for the band's highly-anticipated new album. 

The follow-up to 2009's No Line on the Horizon was expected to hit stores this spring, but now the Irish rockers say it will most likely be out in the summer. 

Drummer Larry Mullen, Jr. tells "The Hollywood Reporter" they were "on a roll" with the new material when they made the decision to "abandon ship" to focus on the song "Ordinary Love" from the film Mandela: Long Walk to Freedom.

Guitarist The Edge says it was something they "just had to do" because of their history with Nelson Mandela and the late South African president's cause.  But the side project has proved to be a rewarding one for U2. 

"Ordinary Love" won a Golden Globe last month, and is nominated for an Academy Award as well.  This year's Oscars will be handed out March 2nd. 

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