Some MTGOX creditors were approached by a Russian law firm (ZP Legal zplegal.ru) saying that they are likely able to recover 170,000 to 200,000 btc from criminals in Russia.
Lawyers cannot predict outcomes, even if there is a 'slam dunk' case.
The bankruptcy trustee is aware of this situation and is looking into it, it appears they have been uncooperative with him before.
There is probably a reason for this, if it is true.
The trustee is the only entity who is entitled to receive assets from anyone who owes MtGox money. If you hired these lawyers, you would need to pay the entire cost out of your own pocket, and could not agree to allow the lawyer to receive a percentage of the recovered assets, unless you are paying this fee out of your own pocket as well. If the trustee does not want to hire these lawyers, there is really not much you can do.
All of the above does not account for the fact this sounds like a scam.
"their deadline" approaches in a few days. they have agreed to make public statements themselves but have so far not provided anything