Arti is our ongoing project to create a working embeddable Tor client in Rust. It’s not ready to replace the main Tor implementation in C, but we believe that it’s the future.
Right now, our focus is on making Arti production-quality, by stress-testing the code, hunting for likely bugs and adding missing features that we know from experience that users will need. We're going to try not to break backward compatibility too much, but we'll do so when we think it's a good idea.
This release has bugfixes for many robustness issues affecting failures to bootstrap. It includes automatic detection and reporting of clock skew, when that affects bootstrapping. (This is a feature we've wanted in Tor for a long time.)
For developers, we've continued to improve our configuration API and make it more consistent. This involves a fair amount of breakage; we hope that next release will only have minor API breaks in the configuration logic.
There are also a bunch of smaller features, bugfixes, and infrastructure improvements; again, see the CHANGELOG for a more complete list.