This is great news and will help a lot to legitimate crypto currencies in the future. Usually people say that cryptos are completely anonymous and that criminals tend to use it for their personal gain. If the authorities can now get the money back its a huge step. Criminals will have to think twice in the future if the really want to use cryptos again. And it gives another layer of security for companies who want to use cryptos.
Just wait until the details are known. We still don't know how the FBI managed to retrieve these coins. In case the hackers sent the coins to an exchange wallet and the exchange handed them over to the FBI, then I would say that the hackers have acted in an idiotic manner. On the other hand, if the FBI had tracked down the hackers somehow and forced them to forfeit the stolen coins, then I would appreciate the FBI. In this case, it would act as a serious deterrent to any such criminal activity in the future.