The latest version of the Couchbase SDK, 3.1.0, has been released with several new features designed to improve developer experience and support various use cases. The new FTS Geo Polygon Support allows developers to perform more complex spatial queries, while Bucket Durability Management provides a way to ensure data persistence across documents in a bucket. Additionally, Bucket Ephemeral Management enables the eviction policy for ephemeral buckets upon creation, and FTS Flex Index introduces the ability to combine exact and fuzzy search capabilities. Other notable features include scoring optimization during Search queries and changes to result expiration handling. These updates aim to provide more flexibility and control for developers working with Couchbase Server.