This information is out of date. The creditors took over the distribution process and are going to distribute the remaining bitcoin pro rata to creditors. Mark Karpales served about 2 years in prison.
I do not think ha actually did serve any time. "he was sentenced to 30 months in prison, suspended for four years, meaning he will serve no time unless he commits additional offenses over the next four years." according to https://en.wikipedia.org/wiki/Mark_Karpel%C3%A8s .
So he did serve some time. I'm not sure though if there is a big distinction between jail and prison in Japan like there is in the US though.
https://www.newsbtc.com/news/mark-karpeles-from-mt-gox-out-o...