In listening to the radio, the fact that a large number of buildings in Noah's neighborhood were burned and the walkers being cut in half/stacked in the truck, there's a gang of rebels running around that will make the Governor look like a lap dog...that's my bet.
Yep, the radio broadcast hinted on a serious bunch of demented SOB's
I believe the radio broadcasts were Tyreese's hallucinogenic recollection of the radio broadcasts he spoke about earlier the ones he heard his dad listening to that scared him when he was younger, the ones his dad told him he had a duty to face as part of paying the "high cost of living" (sounded like Rwanda to me).