You can't file claims yet.
The method for filing claims will be published on this site as soon as we are in a situation to announce it.
Correct. The situation is still rather liquid with the police investigating what happened to some of the bitcoins. I would say it's an open question exactly what proportion should be paid out in liquidation. It's not even clear how many bitcoins were originally present, so that makes it a little difficult to figure out the percentage missing. Opinions vary on what percentage of Mt. Gox bitcoins have been recovered, and there's a complete absence of any proof one way or the other. Hopefully, the police will eventually make known the results of their investigation.
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Indeed, and then there is the question of what will Mr. Nobuaki consider to be your claim -- your final balance on MtGOX, or your deposits minus your withdrawals.
I find it totally bizarre that the former MrGOX clients do not seem to care for this question. Or even understand it.