I already own the trades of RHatO (New52), and of Red Hood/Arsenal. The omnibus does not contain any new chapters or artworks, or?
I rather save my money for current (variant) issues of RHatO and other titles Jason appears in.
Although I have to admit that the Deathstroke New52 omnibus looks appealing. (And I still hope that there'll be a Red Lanterns Omnibus.)