The 2.1.0 version of the Couchbase Java SDK introduces a range of new features and enhancements compared to the 2.0 branch, driven by user feedback. Notable additions include support for N1QL DP4 and spatial View queries, both still experimental, which offer extended query options and more flexible error handling. The update also improves performance under certain workloads, introduces idle socket heartbeats to maintain connections, and offers pluggable retry strategies for faster feedback and customizable request handling. Additionally, a subscribable event bus has been added to facilitate event-driven programming, and DNS SRV bootstrap support allows centralized configuration of bootstrap nodes. The team plans to focus on stabilizing this branch with bug fixes and enhancing framework integration in future updates.