European dates are on, as band plan to play the US next spring/summer
Festival spokesperson says Bono and co are likely to play there eventually
The Edge speaks about frontman's back troubles
Bono's injury means tour is off until late July
One show already postponed after singer goes under the knife
Band played to 97,000 people in the California stadium
Triple-disc edition will be released on May 14
Bruce Springsteen, Madonna and Coldplay also raked it in last year, according to Billboard's Top 40 Money Makers list
The Edge says they've got "something really special"
Singer and rapper combine for new material