I suggested this when the deal was announced. The reason: AT&T primarily wants Warner Brothers for content creation. Turner Broadcasting is an afterthought. Lately, the CNN folks have been consolidating their operations in the old Techwood Place campus in Atlanta. It could make for an easy sale.
However, CBS might not be the only bidder. Viacom is obviously looking for new cable properties. They just lost out to Discovery for the Scripps Interactive channels. They had offered $10 billion in cash. That's serious money. CBS also has some cash in the bank thanks to divesting the radio division. Perhaps they could partner, give the news channels to CNN, and the other channels to Viacom? The Redstone family might like that.