Couchbase Connect 2015 marks the release of Couchbase Server 4.0 Beta, a significant update introducing key features such as N1QL, a new query language combining SQL's power with JSON's flexibility, and Multi-Dimensional Scaling for improved resource utilization and application performance. The update also includes Global Secondary Indexing (GSI) for efficient data retrieval, ForestDB as a storage engine designed for multi-core processors and SSDs, and enhanced security compliance features like LDAP integration and detailed auditing. Additionally, the release enhances Cross Datacenter Replication (XDCR) with filtering options to optimize data distribution across various geographical locations, providing enterprises with a robust, scalable solution for managing distributed databases efficiently.