Blockchain analysis can only go so far, but it does reveal some parameters of the puzzle. We need access to MtGox's accounting system. With that, we'd figure it out much faster than any cybercrime police team would. We are far greater in number and experience.
If they deliberately disclose any of the personal details you would need from their accounting system, like bitcoin addresses conected to specific accounts, I am going to sue them to hell and back. Please list all your own details here, if this is important to you, and people can start digging from that.