Kraken, from what they say, it will support bitcoin cash (BCH) and will enable trading in current pairs BCH/XBT, BCH/USD, BCH/EUR.
From what i read there, you must hold at that time the bitcoin (BTC... at their exchange XBT) and quote:
Bitcoin funding will be halted at 11 am UTC on August 1 – do not deposit during the fork
Kraken will halt XBT funding at 11 am UTC and safely secure funds during the fork. Funding will be re-enabled after the outcome of the fork is clear and the network is safe.
The fork it should be at 12.20 pm UTC (search for your local time on google).
So, you should move your assets there before. And take in considerations transfer time with confirmations. I had a time of almost 3h today with 3 confirmations (i saw on blockchain).
Read more here:
Bitcoin Cash and a Critical Alert for Bitcoin Margin Traders – Kraken
http://blog.kraken.com/post/1150/bitcoin-cash-and-a-critical-alert-for-bitcoin-margin-traders/
Also, see on their website more details then confront with exchanges and others: https://www.bitcoincash.org/
RE: Kraken supports BCC!