Price difference between Kraken en the Chinese exchanges is now over $10. This means arbitration is exhausted for the moment?
It's at $251 on the Kraken at the moment and 253 on OKcoin. That's not a very big difference considering the Kraken is low volume and a small amount of coins can move its market by a considerable amount. Where did you get your figures from?
The exchanges (although tradeblocks reports are quite correct if you want an easy overview). Currently, Kraken is at 219.25 ($248.52), and OKcoin at ¥1,593.45 ($256.56). The difference got a little smaller, but still $8.