We already have a Go driver as well[0] and you can get pretty far by executing queries over HTTP[1] though that's not as capable as a full client. As you said, the roadmap needs some freshening up.
[0] https://github.com/edgedb/edgedb-go
[1] https://www.edgedb.com/docs/clients/http/index#edgeql-over-h...
According to the roadmap:
Looks like it hasn't been updated now that Rust is out. But seems like those are the languages planned.