This incident may be a pretty good indicator as to how we are going to approach the Iranian issue over the remainder of Bush's presidency.
Most of the assets are in place for us to make a move if we want to
This is as good as a pretext as any (take that back, if it was U.S. sailors who had been abducted it would be about as good as a pretext as you could get)
If this was enough provocation to cover Bush ordering a pre-planned general attack, we would move on our own schedule, with the centerpiece being certain time sensitive elements.
I'm not sure that this is casus belli, the Iranians were smart or lucky to seize UK and not US personnel.
Right this minute, I'm more concerned about targeting radars, aircraft without IFF transponders and the like triggering an "incident".
Back when we were spooled up during the Iran-Iraq war, response time to tanker provocations ran 24 to 48 hours. Right now, Monday or Tuesday is probably earliest for a planned "tit for tat" response, there'd need to be high level back and forth between the US and UK, we're still 3 to 11 days out on carrier number three, and "incidents" are possible at any time.