Wisest thing to do is to move your coins into your own local wallet which gives you your own private keys and see how it all works out afterwards, if BitcoinCash does launch then make sure you split your coins before making any transactions.
In general, there is nothing complicated, and personal purses should be a long time. The main thing is not to leave exchangers and other exchanges in their coins. And also it will be very right not to conduct any transactions during this period and then you will save all your coins.
