There were lately speaks of possible Bitcoin dualing into Bitcoin Core (called BTC for now) and Bitcoin Unlimited (called BTU).
Even thought its not sure if this split will even happen they decided to already add trading of it.
Notice they decided to call those two BCC (BitCoinCore) and BCU (BitCoinUnlimited).
BitFinex is currently #1 BTC Volume Exchange
They own 11% of the market of all coins and currencies exchanged to BTC just on their USD pair. I have made a trading guide for this exchange on Steemit before - @kingscrown/learn-more-complex-order-types-on-margin-trading-platforms so can be a good start.
BCC BCU Markets View
So after some price changes they landed on 300 USD for BTU and 700 for BCC. So looks like the split wouldnt make a big difference for us USD wise.