Most likely a combination of suicide attacks and assault on a US base using small arms fire. They will use members of the Haqqani network, or even Tehreek Taliban to do the job. This will be accompanied by a video with images of OBL, verses of the Qur'an and a message from Ayman Zwahiri as part of a propaganda tool. I wouldn't delve too much into the latter. The question is, what is our next move? Karzai will likely wish to meet Petraeus and discuss pressing further on Pakistan, perhaps force them to give up Mullah Omar or other key members of the insurgency. I don't know how the atmosphere is in Washington or if Obama wants to play game with us.