It's more like postponed according to some sources close to U2. Citing "family illness", the dates to be announced for their much-anticipated How to Dismantle an Atomic Bomb tour, originally scheduled to kick off March 1st in Miami, "are in total flux" according to Rolling Stone. Tickets were to go on sale later this month, but that seems to be delayed now. Set design may also be adding to the delay according to longtime tour designer Willie Williams. The tour's stage and video screens are in the process of being built. "We are developing some new technologies to deliver visual content". For anyone who has been to a U2 concert knows, the staging is such a part of the show, apart from that giant lemon on the Popmart Tour. Whatever ends up happening, it will be well worth the wait.
Some plans are still on target, though. The band still intends to play the February 13th Grammy Awards ceremony in Los Angeles, for which they are nominated three times for the single "Vertigo," and to attend its induction into the Rock & Roll Hall of Fame on March 14th in New York.
In a sidenote, U2 posted a message on its website assuring fans that Adam Clayton was not harmed during the tsunamis as was rumored.