This is the pro-Taliban Pakistani militant who is the leader in the clubhouse for the coveted title (in South Waziristan, at least) "mastermind of the Bhutto assassination".
This dude has Bad News written all over him.
The current thinking is that extremists are behind this despicable act. Bhutto supporters still blame Musharraf and the ISI, but, at least according to the media, this seems unlikely. From my less-than-expert perspective, I agree - Musharraf has WAY too much to lose if he gets caught with blood on his hands.