Gox did go bankrupt, and the total body count is 850,000 coins - 750,000 customer coins and 100,000 of the exchange's own. Here's Mark at the Tokyo District Court at a news conference:

http://www.reuters.com/article/2014/02/28/us-bitcoin-mtgox-bankruptcy-idUSBREA1R0FX20140228

There's more, though.  Also, there's a $27+ million discrepancy in Gox's bank account.

7% of all bitcoins in circulation are now owned by hackers, plus any previous thefts.

Mark is "very sorry"