I would love to see firmer support for the existing non-x86 architectures. I feel a bit guilty that I'm only building i686 and x86_64 for Fedora so far, but these are the only Tier 1 targets. Perhaps I should bite the Tier 2 bullet for aarch64 and armv7, but the rest don't have bootstrap binaries for rustc and cargo, especially ppc64 and ppc64le I'd hope for next.