The MongoDB Rust driver team is pleased to announce the first beta of the driver, v0.10.0. This release adds async support to the driver, with the option of using either tokio or async-std as the underlying runtime. You can read more about the release on Github, and the release is published on https://crates.io under the package name mongodb. If you run into any issues, please file an issue on JIRA.
Thank you, and we hope you enjoy using the driver!