I feel like I'm on the only one that is out of the loop on this DAO hack: Could someone provide some context? Who is the author? Is he the attacker? What does

I feel like I'm on the only one that is out of the loop on this DAO hack: Could someone provide some context? Who is the author? Is he the attacker? What does the Keccack hash prove? Does Ethereum even use Keccak? Or is this just some troll posting?