Bono tells Rolling Stone that the band is working on "club-sounding" album.
The bands also plans to release a rock album and "Songs of Ascent," a set of tunes from the recording session of their latest disc, 2009's "No Line On the Horizon." Bono and The Edge will also score for the upcoming Spider-Man musical.
Bono had emergency back surgery in Munich in May. The group's 360-degrees World Tour resumed on Aug. 6 in Turin.
Bono says he thinks he "could have made a limp work."
He adds: "There are a lot bigger problems out there than the ones I was facing. ... But I came out of it perfect. And I feel incredibly grateful."
The September issue of Rolling Stone hits newsstands Friday.
