I'm happy to see Fourzerotwo clarified that. I never fully bought into the idea of a third map pack, or at least the one being rumored, but wasn't really sure what to think, seeing as to how such rumors have indeed been true in the past.
Hopefully there will be a third map pack, and I think there will be, but chances are the maps rumored to be in it will not be, especially maps that are already playable in the campaign game mode, because that would be charging for something we already have.