As someone who has written a fair bit of Go code, I also find myself keeping a close eye on Rust. The things that really appeal to me are the possibility of immutable (by default) types, thread-local memory (ie. owned pointers), no null pointers, and generics. These are all basically aspects of the type system that make concurrent programming safer and more predictable.
I've also written a fair bit of Go and have recently taken a full dive into Rust [1, 2] and it's been a ton of fun so far. I really love both languages. Their features and goals have a pretty small intersection, but I enjoy both a lot.
If you want to take a dive and are willing to put up with a little instability, now wouldn't be a bad time. The 0.10 release appears to be on the horizon and they just released binary installers, which should make tracking tip much easier: https://mail.mozilla.org/pipermail/rust-dev/2014-March/00922...
