Sounds like a big blow to poswallet. I checked the site after I saw this... I think the worst "PR" for a wallet is to announce that they were hacked. I read more about them, and in fact they are launching new versions with Ledger promotions. And now asking everyone to withdraw all coins.
9.8 BTC is a lot but for wallet and exchange is nothing. Now everyone will withdraw and panic.
Yeah well, they'll withdraw until they hit the missing balance I guess :/
And yes the posw2.0 thing has been coming since the end of june..