Author here. Git 3.0 is the first major version in 11 years.
Key takeaways:
- SHA-256 becoming default (brian m. carlson has done ~100 of 200-400 needed patches)
- Rust becoming mandatory build requirement (controversial but necessary for memory safety)
- Reftable format shows 22x performance improvement in benchmarks
- Timeline depends on getting Git forges (GitHub, GitLab) ready with SHA-256 support
The Rust decision is particularly interesting - Patrick Steinhardt's proposal is a "trial balloon" to gauge ecosystem readiness. Happy to answer questions!