It would probably make sense to advertise that we want people using this target to give us feedback, so it might make sense to cross-link this from users.rust-lang.org and reddit as well.

It would be interesting to know what the plans of emscripten itself are with respect to this target - is it going to be supported for the reasonable future or are people migrating to wasm32-unknown-emscripten ?. It might be worth it to query emscripten maintainers here too.