Hi Robert. We, at Kotlin team, are working on a Kotlin-to-Wasm compiler.
Wasm GC spec is being discussed by a dedicated community group. Browser devs are working on a Wasm GC prototype.
Binaryen devs are currently working on code optimisation for Wasm GC. I hope this will turn into something awesome once everything clicks together, but I wouldn’t expect it to be ready soon.