At this point there’s no roadmap nor white paper as not deemed necessary as long CHIPS is still in the active development phase without any marketing focus. The closest thing to a whitepaper can be found here: https://supernet.org/en/resources/updates/chip-and-a-chair-let-s-use-bitcoin-s-lightning-network-to-create-a-poker-game

And there is the PANGEA whitepaper.