Any plans for rust lang bindings? (would prefer to avoid FFI to c++)

Check out https://github.com/stepancheg/grpc-rust. Still in development.

Any plans for rust lang bindings?

would love community contributions :-). I see some efforts in community but nothing very concrete yet. You can suggest project in gRPC Ecosystem. https://github.com/grpc-ecosystem

One rust crate that seems fairly well along is https://github.com/stepancheg/grpc-rust. It claims it can communicate with the go client.