The hacker (a bit of a misnomer, as he has pointed out) returned 50 BTC, and I have just distributed it to affected users. Looks like the other 65 will be sent, too.
Does anyone else get the feeling this might be the same hacker who raped Darkcoin?
https://bitcointalksearch.org/topic/m.5398601
Through some investigation and through a mixture of guilt, the "hacker" (who claims he actually isn't a hacker and the BTC simply appeared due to a mistake), came back and contacted the right people to start giving back the BTC he had taken from the exchange, since a lot of other people were affected and had their funds frozen. Of course he had lost a lot of value by filling very cheap buy orders for DRK so he can't possibly give it all back but the important thing is the dumps are stopped now and the coin has stabilized again. It has found solid ground and is starting to rise again. This rise will be fueled by the 3rd DarkSend alpha test which is happening tomorrow and after that, the developer (eduffield) has said that the beta will come soon as the code is very solid.
Looks incredibly similar to what happened to XCP.