I was sure they were closing and suddenly found a new investor and started to advertise come back but never followed them closely.
How much was stolen?
You can follow the discussion and updates about the cryptopia hack on their bitcointalk thread https://bitcointalk.org/index.php?topic=1669443.0;
also their twitter and discord is a good place to get information.
The only official announcement was they lost 9.4% of all customer's holdings on the recent hacking incident.