Too Long; Didn't Read
The Lisk interoperability solution was published during Lisk.js 2021 event. The team organized the project around 8 roadmap objectives. Each objective defines one key aspect of the solution that is addressed by one or more LIPs. The LIP aims to introduce the data structures and the transactions necessary to exchange messages between chains participating in the Lisk ecosystem. The remaining 14 Lips provide the necessary building blocks for it to happen. Some of these are already present in our research forum and the remainder will be published in the next few weeks.