The original plan for Omega was for it to be seven issues, but it sounds like issue #5 is now the last. From what I've read, the final two issues will still be released by they won't be under the "Omega" label.
Makes no difference to me, other than I foresee some additional delays in their release. It will be worth the wait.
When I was checking wikipedia to find info on the last trade the last two issues will be labeled "Alpha".
It also has a story featuring Riddler, back when he was reformed. Speaking of which I much liked it when Ivy, Harley and Riddler were 'good guys' befor the reboot.
Isn't Ivy good now? Or at least an anti-hero. I don't read Suicide Squad but I think Harley is still looney? Did Riddler even appear in 52 yet?