Yes [1], but it's incomplete, needs a lot of TODO resolution and cleanup, (insert other scary disclaimers here), etc. I also have some slides from a presentation [2].
If the reason you guys want a WebRTC implementation in Rust is to be able to write WebRTC server software in Rust, you might be interested in Janus -- it's a plugin-based C WebRTC server with a C ABI for plugins that you can easily write in Rust.
[1] https://github.com/simmons/webrtc-sctp [2] https://cafbit.com/post/rust_webrtc_data_channels/