This project's whitepaper work is still ongoing. Till now you can read the latest medium article and docs to know more.

Medium Article: https://medium.com/narwhalswap/introduction-to-narwhalswap-50fc4a2ca83f
Docs: https://docs.narwhalswap.org/

This weekend, we will publish more details of the protocol. Once published, we will update at here again.