Yes they are, but as expected all withdrawls disabled. They announced blog https://blog.kraken.com/post/1449/kraken-returns-with-free-trading/ "Withdrawals are now disabled and will remain disabled for a minimum of 12 hours (during this time we will be monitoring the new system for anomalies)"
BUT ALSO
"ith trading now resumed, the engine’s performance will be closely monitored. The site will come down if needed, which may occur with little to no notice. "
They must be kidding?