Good introduction to Rust in Linux by some of the developers that are doing the work: https://security.googleblog.com/2021/04/rust-in-linux-kernel.html … (disclosure, I helped a tiny bit with the C examples...)
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No, but there is a stable GCC 9 that I can use to compile my old kernel. Maybe it's not getting fixes today but it was polished over a long time. But there won't be a stable Rust 1.30.x I can keep using in the future.
You can use the exact same copy of the rust compiler that you used to build the kernel when it was released, just like you do today for your C compiler. There is no difference here.