Since when did legal disputes happen where you cannot say you are in a legal dispute? When megaupload servers were seized we knew about it instantly and were able to follow the case reasonably well.
Could ukyo not have just said 1 month ago "we cannot return the coins now because of a legal dispute with the SEC".
Ukyo said in the beginning of November that he had "a rather important and very positive announcement" about weex. Remember that it doesn't have to be a problem with a government agency, it could be another company.
And why could the 6% be returned now and not earlier?
He had to create the claim site so he could manage the distribution of available coins and people could see the status of their stuck funds. He might also had to get it cleared legally.