[untothebreach]

Warning: I am not involved with the project, and it has been a while since I heard anything official.

With that said, the last time I heard, the reason for Rust's existence (Servo) did not have any plans for implementing anything outside of the browser rendering & javascript engine. So, no browser chrome, which would be the only reason I can think that they would develop an "official" UI toolkit.

I would love for someone involved in the project to correct me, though :)