You can see it here - A new operating system written in Rust - YouTube
KataOS is not a rewrite of Fuchsia, nor an OS entirely implementef in Rust. It is a Rust userspace for the seL4 microkernel/hypervisor. seL4 is written in C, but has a formal proof of correctness. Google is still mostly working on Fuchsia. KataOS is nothing more than a research project as far as I know.
For some definition of correctness. ↩︎
It may be a side project or just a research but looks more secure.
IIRC KataOS is designed for iot devices, while Fuchsia is more targeting Android (or perhaps ChromeOS)
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