OMEGAMON XE for CICS is the last of the bunch to release a V4.2 version, and that version is targeted to go GA in December of '09. We're almost through the month of November, so that means that once OMEGAMON CICS is available all the core OMEGAMONs (z/OS, DB2, CICS, IMS, Storage, Networks) will be available in a V4.2 version.
So, if you haven't done so already, now is the time to start planning for that migration to V4.2. Each of the OMEGAMONs has new feature/function in V4.2, so there is considerable benefit to going to the new versions. And that's true both for 3270 users, along with those users that use the TEP (aka the Tivoli Enterprise Portal).
With apologies to Mel Brooks fans, all I can say is "you do that 4.2 that you do so well"!!