The GC proposal recently moved to phase 2 and has a lot of momentum. Teams working on compiling Java, Kotlin, and Dart to Wasm are closely involved in the standardization effort and implementations are under way in V8 and other Web engines. Right now the bulk of the effort on the standardization side is in tweaking the instruction set to simplify it and improve performance and on the implementation side the focus is heavily on optimizations, both offline and in the engines.