Will there be a 'fork' when PoS is released such that there will be 2 types of Ethereum after the split (one PoW and the other PoS), much like Ethereum and Ethe

Will there be a 'fork' when PoS is released such that there will be 2 types of Ethereum after the split (one PoW and the other PoS), much like Ethereum and Ethereeum Classic?