I think if people really would want to know who he is, someone would already hack his accounts and trace his ip or something.
Nothing to find there, theymos and others have mentioned he always used TOR.
Bitcoin is a decentralized network, not sure if it was planned but not knowing Satoshi at this point is a good thing. It forces developers to work together without a king to issue decrees.
Precisely. Just like the software is decentralized, the human management behind the software is also decentralized.