Hundred of thousands USD have been stolen. As of now, it seems the hack is over but I would advise you to be careful.
A user of the MyEtherWallet reported on Reddit that their wallet has been hacked for .09 ETH.
On the Ethereum subreddit :
“Do not use myetherwallet.com if you’re using Google Public DNS (8.8.8.8 / 8.8.4.4) at this moment, it seems these DNS servers are resolving the domain to a bad server that CAN steal your keys!”