The Edge said that he had recently "listened to some tracks that we're gonna release with the new Unforgettable Fire reissue, some new songs that we discovered that we'd recorded, back in that era - the '80s - that we're gonna put out. And they sound amazing."

Bono called "Disappearing Act" "incredibly special" and The Edge added that "it was originally called 'White City,' and it was a track we started with Brian Eno and Daniel Lanois back in 1983 when we were recording The Unforgettable Fire. And we discovered it about six months ago, and we dug it out and did some work on it in France a few weeks ago, and it's now finished."

The pair also touched on the financially-troubled Spider-Man musical that they've written music for. The Edge said that it is not a traditional musical but "It touches on opera, it touches on rock & roll. There are some real character-driven songs as well, very unusual song types for us."

There is no set release date for the deluxe re-issue of The Unforgettable Fire, but U2.com promises it will be out "later this year."

In other U2 news, the band has recorded astronauts on board the International Space Station singing "Your Blue Room" from the Passengers album, which the band expects to incorporate into their U2 360 Tour in the near future. Passengers was the collaborative alter ego used by U2 and Eno for the 1995 album Original Soundtracks 1.