The band has appeared The Academy Awards, a Super Bowl commercial, and on the premiere of The Tonight Show with Jimmy Fallon over the past month. That was expected to lead to a new album release this Spring.
But, a source tells Billboard, "It seems to be taking longer for them to finish an album as they get older, but the great thing about U2 is that the whole of a record is always better than the sum of its parts. That magic that the band always seems to capture ... they have yet to capture it."
They've apparently booked more time with producers Ryan Tedder and Paul Epworth. They've also been working with Brian "Danger Mouse" Burton.
In addition to the album delay, it appears that the band will not tour until 2015, also. No tour dates had been announced, but Billboard says that the band was planning on announcing a tour in March.
The band did release a song called Invisible back in February. It was a part of a joint project with Bank of America to raise money for RED.