The hack of the Japanese exchange in 2014 resulted in the loss of 850,000 Bitcoin, then worth close to $1B, and marked the beginning of a prolonged bear market for Bitcoin.
Eventually 200,000 Bitcoin were recovered but Japanese bankruptcy rules stipulated that Mt Gox account owners will get their money back in US Dollars, meaning they'll lose the appreciation of Bitcoin since the 2014 hack. Naturally, Mt Gox account holders were outraged by the idea that the exchange would profit hundreds of millions of dollars by being hacked.
Now they may have caught a break. The exchange has transitioned from bankruptcy to civil rehabilitation, a process which will allow it to return all of its assets (currently 138,000 Bitcoin) to account holders.
The rehabilitation is expected to start in February 2019 and the Mt Gox trustee is not expected to sell more of the exchange's Bitcoin until then.