Rust 1.89.0 has been released, introducing several enhancements including support for inferred arguments to const generics, a new lint for mismatched lifetime syntaxes, and improved handling of external C functions with i128 and u128 types. Additionally, changes in target support were announced, notably demoting x86_64-apple-darwin to Tier 2, and new APIs have been stabilized. The Rust team encourages users to test future releases and report any bugs encountered.