Gian,
the information on the claim form asks for balances on Oct 31 and also what was transferred out after that. I don't know how they will handle losses for anyone stuck. How would they know open stop loss orders, or if one had mental stops, etc..., but maybe they will just say that was your balance on Oct 31. I don't know.
They also ask if any positions were on foreign exchanges as opposed to only US exchanges. I would think that might be some foreign currencies or some other commodities. Guess it has to do with the fact MF has presence in other countries and it may be a whole nother story to pull money back from other countries.
As Neil Cavuto said on fox this morning maybe MF now stands for MF'ed.