Unity 6.6 adds WebGPU, build analysis and CoreCLR prep

Unity 6.6 is now available as a Supported release, adding a scene-only Enter Play Mode default for new projects as preparation for Unity 7’s CoreCLR transition.

The release makes WebGPU production-ready for Web builds while retaining WebGL 2 as the default with automatic fallback.

It also adds native Dictionary serialization, Content Directories for local content loading, and a Build Analysis window for investigating build size, steps, dependencies, and failures.