IBM has just announced the following:
Tivoli OMEGAMON XE on z/OS V5.1.1
Tivoli OMEGAMON XE for Mainframe Networks on z/OS V5.1.1
Tivoli OMEGAMON Management Suite on z/OS V5.1.1
Tivoli OMEGAMON XE on z/VM and Linux V4.3
The OMEGAMON Management Suite is an integration of OMEGAMON OMEGAMON z/OS, Mainframe Networks, and OMEGAMON Storage.
The announced date for OMEGAMON z/OS V5.1.1, OMEGAMON Mainframe Networks V5.1.1, and OMEGAMON z/VM and Linux is July 26, 2013. The announced date for the Management Suite is September 6, 2013.
Here is a link to the announcement: