When you think about it, this is an incredibly clever move on Gox's part, at least in the short term. You've got a bunch of frenzied traders beating the crap out of each other and Gox harvests the spilled blood. Only Gox insiders can withdrawal to arbitrage, and I guarantee you they have. Who the hell do you think gets to "beta test" these changes? MK's cronies. This is little more than a swindle, whether it was intentionally done or not.
I also think they actually deliberately making their statements vague and delays long - since they are lacking funds they want the price to be as low as possible *to get as much money in as possible* when they reopen withdrawals, everyone would try to arbitrage, and they will have a hard limit on withdrawals (and open end on deposits I assume), so they will be able to fill their coffers and start paying out bit by bit. Otherwise, they'd go broke in twenty minutes.
Also, if they do turn out to be insolvent (which I believe is unlikely), their fiat obligations to creditors are much less now. If you're on the brink of insolvency, it makes sense to crash the value of your debt obligations, if possible. For Gox, it was as easy as disabling withdrawals.