The other option is for them to sell off Direct TV and retain Turner Broadcasting... Seems like some good ol' monopoly busting/prevention is finally coming out of the DoJ.
AT&T has already invested heavily in integrating the DirecTV, DirecTV Now and U-verse TV services. AT&T has made clear that these services are key strategic assets going forward. The DoJ knows this, so it is reasonable to conclude that their goal is to force the sale of Turner Broadcasting. The question becomes why would they want to force this sale. Given Trump's statements it is more than reasonable to conclude that it is to change the ownership of CNN.
I don't know what the DOJ is actually playing at, but I suspect it's to prevent a combined AT&T from locking Turner networks to DirecTV (either by fiat or by prohibitively expensive contracts).