DB2 Viper 2 is out of beta and now available as DB2 9.5 for Linux, UNIX, and Windows. The What’s New guide provides a complete list of all the new features. If you’d rather take a test drive, download DB2 9.5 now.
PS. If you’re looking for a version of DB2 for Linux, UNIX, and Windows that is free to develop, deploy, and distribute, check out DB2 Express-C.