The document summarizes the new features in MongoDB 2.8, including improved query systems with new operators, integrated text search, enhanced security features, and improved operational capabilities. Key updates involve index intersection for optimized queries, pipelined data transformations, new update operators, expanded set operators, field-level security and access policies, text search integration, authentication with LDAP and certificates, user-defined roles, auditing, and performance/scalability improvements like connection pooling and resource protection. Future releases may include document-level locking, pluggable storage engines, expanded monitoring, backup, and automation APIs.