I think MtGox agreed to US jurisdiction, thus it may allow a very quick injunction to freeze all Gox assets that a Japanese court would probably just assent to due to the agreement of jurisdiction. I would keep all funds out of Gox until you can see this taking years or not.
The contract is governed by laws of Canada, USA and Japan, if any of the these countries' law or regulation weren't complied with - the contract is void (it is actually is in the contract).
Data privacy laws, were they followed in all three countries?
Financial regulations of selling private accounts?