So the Rust Embedded Devices Working Group is a part of the Rust Project. But, as we're not active compiler developers/maintainers, and merely (merely!) users of the Rust programming language and toolchain, that may change.

But as it stands we have sub-groups looking at Rust on Arm, and Rust on RISC-V, as well as handling documentation and other areas.

My area of focus is Rust on Arm, where are are:

The maintainers of of the bare-metal Arm targets (like thumbv7m-none-eabi, for Rust on Cortex-M3)

Owners and maintainers of the fundamental libraries required to do anything with bare-metal on this platform (like the cortex-m and cortex-m-rt libraries)

Maintainers of some fundamental "trait" crates, like embedded-hal, which allow a whole ecosystem to glue together around some common (and relatively basic) traits that describe, say, what an SPI peripheral is. This allows the developer of a driver for, say, an Adafruit 5" colour LCD, to be abstracted away from which particular microcontroller implements that SPI peripheral.