BIP 148 will happen. It is a uasf or user activate soft fork. It is not 100% that the chain will split, but if not enough miners signal support, the chain will split. It is advised that you move your bitcoins into a safe wallet; a wallet that you control your the private keys. If you leave your coins in the exchange, if ever there is a split, there is a possibility you will not get the other coin.
But is it true that will have bitcoin classic or is this a joke?
"Bitcoin Classic" is just a name we're using to refer to the original Bitcoin (the one we're using now).
People who say that are pretty much assuming that the BIP 148 chain will be relevant, and that if it is it will be listed as the main Bitcoin. Whether that's true mainly depends on exchanges and merchants.
I suppose the comparison comes from Ethereum and Ethereum Classic.
i thought its just BU but there's also bitcoin classic?
Bitcoin Unlimited has not happened.