The xDai and Gnosis partnerships means all Gnosis applications will be deployed to xDai. Interoperablity will allow apps to be deployed on both networks, utilizing xDai for fast and inexpensive transactions while maintaining application on Ethereum Mainnet. xDai will serve as a primary staging environment for Ethereum, due to its migration capabilities, token economics, and low transaction costs.
More details on interacting with Gnosis DApps on xDai will be available here as they are developed. Read about the partnership: