They probably don't know the answer or can't legally tell you. I wouldn't be surprised if most answers the call center gives are "Sorry, we don't know/can't tell you".

If japan is anything like other countries, there will likely be a date set for a creditors meeting, and the call center will simply be instructing people to attend the creditors meeting to have their questions answered.

Anyone who has money (either fiat or btc) in mtgox is essentially now an unsecured creditor and mtgox seems to be in bankruptcy protection / proceedings. You wouldnt get answers out of any other company in bankruptcy or insolvency, everyone will just have to patient until the Investigators/Administrators have finished their audits and have a restructure plan in place.

Another one to anticipate in the FAQ: "will MtGox provide last known balances in fiat and BTC and account transaction histories?"

Presuming that .csv files and screenshots would constitute proof of claims in a court of law is unbelievable.

Possibly this (opening an infoline) is something required by Japanese law for every company filing for bankruptcy. Just guessing though.

Most logical answer is because they don't know. By delaying statement, they're probably hoping to buy enough time so that they can actually answer those questions.