Miguel Ojeda has posted an
update on the Rust-for-Linux project.

This second year since the RFC we are looking forward to several
milestones which hopefully we will achieve:

• More users or use cases inside the kernel, including example drivers – this is pretty important to get merged into the kernel.
• Splitting the kernel crate and managing dependencies to allow better development.
• Extending the current integration of the kernel documentation, testing and other tools.
• Getting more subsystem maintainers, companies and researchers involved.
• Seeing most of the remaining Rust features stabilized.
• Possibly being able to start compiling the Rust code in the kernel with GCC.
• And, of course, getting merged into the mainline kernel, which
  should make everything else easier!

Source: LWN.net – Ojeda: Memory Safety for the World’s Largest Software Project