I just called the telephone service MtGox have (+81 3-4588-3922 ) and the only info I could get out of the Japanese girl was that all account informations are intact and it will be possible to log in on the website later some day. She was speaking a lot about stuff going on in court right now that has to finish, but nobody knows how long it can take.

Called for about 5 minutes. Queue wait time was short, below 30 seconds.