I have contacted the offices of my law firm (Bingham) in Tokyo to begin proceedings to sue Mt.Gox / Tibanne Ltd / Mark Karpeles for my USD funds. He advised me that suing for USD is much more reliable than suing for BTC (since the price varies and bankruptcy collection on BTC has unclear legal process). We believe that there are numerous other plaintiffs in the early stages of filing suit and suspect that is why it appears that accounts are liquidating to cash on Mt Gox.
If you are interested in being co-plaintiffs in this suit, please PM me (I'm happy to split legal costs), and I will put you in touch with the partner I am dealing with. Note that you will need to provide full proof of identification as well as proof of account ownership on Gox (to be provided to Bingham, not myself).
In general, a class action type suit is most likely to get everyone their funds (or fair percentage thereof) than if we all file separate law suits.
TL;DR please sell your coins for USD on gox so i can buy them cheaper?
No, you do not need to sell your coins. But when it comes time to file the suit, you'll have to list the USD you are suing for - and you can only collect what you declare as your holdings. The initial filing should be ready be middle of next week.