Bitcoin Cash (BCH) intentionally does not have a separate whitepaper. Its community believes Satoshi's original document already perfectly describes their vision, which is why they retain it.

For the actual tech specs and upgrades: https://bch.info/en/chips
For more general information: https://bitcoincash.org

Try sending some Bitcoin Cash to a friend today! The instant, near-zero fees make it incredibly fun to use and perfectly capture the vision of simple, borderless money.