The LiquidApps team published an article in which they explain how the various services of the DAPP Network can be used to enable IBC between smart contract blockchains.
The two main services that would allow Inter-blockchain communications (IBC) are:
Through these, dApps can move their operations to different blockchains, always keeping their data safe through the DAPP Network. Alternatively, they can operate directly on LiquidChains and save their application state to a public chain.
"it is only through interoperability that each chain can maximize both its own potential and the capabilities of EOSIO as a whole. Working together, EOSIO-based chains can scale the network horizontally into a single, powerful blockchain layer and become the leading infrastructure for decentralized applications."