Epic Games CEO Tim Sweeney plans to create an interoperable metaverse by using Unreal Engine 6 as a platform for development. The company aims to expand the gaming ecosystem beyond walled gardens and into a metaverse where players can use digital assets across different games. This vision includes interoperability between games like Fortnite, Minecraft, and Roblox. The goal is to increase player trust and engagement by allowing them to own and use digital items across multiple platforms. The implementation of blockchain technology may be necessary to ensure trustless verification between systems.