It is interesting no one suggested Rust project internal ide support. They are developing something called Oracle.This is basically everything IDE needs (autocomplete, reference finding, error checking, etc). Oracle haven't finished yet.But after Oracle being ready, I think every editor/IDE out there can provide best experience for rust by simply calling a bunch of API which is very simple thing to do compare to writing their own AST and autocomplete.
About the project, not being GPL is serious bummer for me. I don't want to GNU project isolate more than this and anyone other who has simple understanding of politics behind the scene will understand GNU as foundation have done a lot of good things for programmer/developer/hackers community.By far more than any other player in this area.
And since I have worked on Glibc for a while and I wanted to use rust just for experiment,I was seriously considering to work on this project if it were GPLv3.