Hey, I saw that links to the Embedded Working Group[0], TockOS[1], and others have been posted already, and those are great places to start!
My company, Ferrous Systems[2], is also focused on embedded systems development in Rust, and we are already helping companies both with embedded linux and bare-metal/RTOS projects in Rust.
We're also running a conference in Berlin on April 26th-29th called OxidizeConf[3] if you are interested in learning more about what is already going on in the Embedded Rust world :)
[0]: https://github.com/rust-embedded/wg