After that gaffe of blowing up the Jordanian wedding party I'm sure Zarqawi has every reason to want to disappear. I imagine that OBL will send out a new general to take over operations in the Iraqi theatre.
You don't understand the Zarqawi network. Zarqawi was never a general of Osama he has his own network that is totally seperate from al-Qaeda the origional network. If he was really killed we will know tomorrow because Zarqawi's generals will begin to fight over command of the network and it will be one of Zarqawi's generals that in the end controls the network.