MongoDB 3.0.4 has been released and is now available for production deployment, addressing several performance and replication issues that were present in the previous version. These fixes include resolving problems with background indexes, large document performance on Windows, secondary reads blocking replication, and other issues related to WiredTiger storage engine and sharded clusters. The release contains only bug fixes since 3.0.3 and is recommended for all 3.0 users to ensure optimal performance and reliability.