The .NET driver team has released version 2.0 of their MongoDB driver, introducing two major features: async support and a new API. The new API is designed to be more consistent with other drivers and provides a streamlined interface for interacting with MongoDB. Async support allows for non-blocking operations and is implemented at the lowest level, making it 100% async. The new API has been coordinated across all drivers to increase consistency, while also introducing lower-level changes to standardize cluster configuration and state discovery. The driver can be used with .NET Framework 4.5 or above, and a legacy API is still supported for backwards compatibility.