According to a recent post on Blabbermouth, Danny tore his bicep while lifting something at his home. He is expected to be examined by doctors again this week to determine exactly how long it will take him to recover.
They also speculate that Tool may have trouble rescheduling shows due to many arenas sports commitments. I’m sure that might be a minor inconvenience, but I’m pretty sure these arenas are not busy every night of the week. Also mentioned is that apparently Tool will continue touring though to June 2008.