This is definitely cause for concern, as generally, the only limit a bank puts on a client's ability to make payments is the balance in the account. There are some other obscure possibilities (compensating balance requirement due to loan covenants, or even some type of capital controls) but more than likely, this new "policy" is due to cash flow issues.
Or maybe they removed large amount of fiat from the business in case the US court case turning out bad.
The silence from MtGox about this issue is deafening.
I suspect that MtGox has a very serious banking issue and it's being played down for now. If the truth was known I suspect there would ba a mass exodus from MtGox.
No wires = no business.
Has their main bank account been frozen ? I see no evidence that it hasn't.
The employees / owner who are usually present in #mtgox and some other channels on IRC have pretty much disappeared since late last week when this problem started.
I'm wondering if this is a worst case senario for MtGox happening right now.