The Neo4j 2.3 Milestone 2 release is now available for development and experimentation purposes only, as not all features are fully operational. This release aims to make Neo4j more scalable and efficient in handling graph data by optimizing resource usage. Key improvements include a highly scalable off-heap graph cache, which reduces strain on the garbage collector and provides significant performance gains, particularly in concurrent read scaling. Additionally, there are improvements to the Cypher cost-based optimizer, compiled runtime engine, and user experience enhancements such as code-view, allowing users to inspect the http requests sent to the server and reproduce issues using tools like curl or Postman. The release is available for testing and feedback, with the next stable version of Neo4j 2.3 scheduled for future release.