All of exchanges that i am using, closed their bitcoin wallet for deposit and withdrawal. Some of them want to take my BTC and give me BCC instead. This is certainty and they said on news.
BCC's value is 0.1 BTC at now.
Which exchanges are doing that? I don't think any services announced they are
replacing BTC with BCC.
I believe some exchanges (Kraken, Bitfinex, several Chinese exchanges) will be crediting BCC to BTC holders
in addition to there BTC holdings, and may open markets for the new coin. But from everything I've read (and aside from the regular counterparty risk you always have to be careful with), all the exchanges are either ignoring BCC or giving it to their users on top of their current holdings.