IBM has announced the end of service for DB2 9, effective June 27, 2014.

DB2 10 for z/OS continues to build on the formidable capabilities of DB2 9 for z/OS, and delivers innovations in these key areas:
Improved operational efficiency for "out-of-the-box" DB2 CPU savings
IBM's internal testing and early beta customer results revealed that, depending on the specific workload, customers could achieve out-of-the-box DB2 CPU savings of up to 5% - 10% for traditional workloads and up to 20% for specific workloads; when compared to running the same workloads on DB2 9.

Unsurpassed resiliency for business-critical information
DB2 10 innovations raise the bar on data resiliency through scalability improvements and fewer outages. DB2 10 delivers the ability to support up to five to ten times more concurrent active users in a single DB2 subsystem than in DB2 9, allowing customers to scale-up or scale-out simply, and with less system management.

Rapid application and warehouse deployment for business growth
SQL and pureXML enhancements in DB2 10 help extend usability, improve performance, and ease application portability to DB2 for z/OS, supporting your efforts to create an efficient, productive application structure with a sustainable competitive advantage.