Well we've haven't heard of any examples that CO changed the policy so I imagine they are still strickly for drinks. Don't forget if you get an aircraft with DirectTV headsets are complementary. FWIW I always keep the headset adapter (non DTV aircraft) so I have at least 3 stashed in my laptop bag.

They could be eventually expanded to include BoB meals but I don't know how much the meals will cost so you may have to use 2 certs per meal. If this policy changes it will likely come as part of the UA/CO transition.