So, let's see, AT&T has renegotiated (or is currently renegotiating) carriage contracts this year with:
- Viacom (deal was struck in April, resulting in Viacom channels getting added to AT&T's new Plus and Max packages)
- A+E Networks (June)
- CBS (August)
- Nexstar (largest owner of locals, August)
- Disney (September)
- Sinclair (2nd-largest owner of locals, September)
Am I missing anyone?
Going back in time, we can see that they
renewed their Fox deal for several more years just last Nov (2018). Looks like they renewed their
deals with both Discovery Networks and NBCUniversal back in Sept. 2016. (Given that both deals covered DirecTV Now too, it's odd that none of the Discovery-owned channels have shown up in that service's new Plus and Max packages that debuted in March 2019. However, NBCU channels like USA and MSNBC are included in both Plus and Max.)
AMC Networks apparently renewed their deal with DirecTV back in Nov. 2014. Along with Discovery and A+E, none of the AMC channels have yet appeared in the new Plus or Max packages. Five years is a long while, so it's certainly possible that the current contract with AMC will be lapsing soon. If there's going to be another potential blackout this year on DirecTV, AT&T TV and AT&T TV Now, I'd put my money on AMC Networks (which includes BBC America, IFC, Sundance, and We TV).
DirecTV
renewed their deal with Hallmark/Crown Media back in March 2008 and then AT&T first added it to Uverse TV in July 2015; perhaps that latter deal also covered a renewal at DirecTV too. I can find nothing about any subsequent deals/renewals between AT&T and Hallmark, although The Hallmark Channel appeared in both Plus and Max when those packages debuted on DirecTV Now this past March, so apparently Hallmark has been cleared for streaming.
There really aren't any noteworthy cable channel groups outside of those I listed above.