Mt Gox failing doesn't surprise me. The number of people stepping up and saying this is a hoax or fake does surprise me.
Over 2 months ago I responded to a poster on another bitcoin story who said they had waited over 5 months for their withdrawals. That means Mt Gox has not been solvent since at least last summer.
How can there be a run on a bank you can't get your money from? While the recent freezes of USD and BTC withdrawals were only recently announced it appears that you couldn't really get your money out before either.
I'm going to take a guess. An investor received this document, was appalled and published it.
If I was an investor in Mt Gox and received a document like this, which is clearly an admission of very illegal activity, I would publish it publicly and forward it to the FBI. I don't think there will be a gox.com, but I do think someone will end up on an Interpol list in a few days. Mt Gox wasn't run by people who should be celebrated, it was run by criminals who knowingly took monetary deposits for their insolvent for-profit business.