Hi Glenn,
We are constantly updating new features to the app, not all of these features are announced. It appears that by default the app will select the best quality/channel that your connection to the network can support. To test this I pulled up the guide and turned off all filters. I tapped on the program currently on cnn. The channel automatically selected the HD version of the channel even though I specifically selected the lower channel number. The description of the channel said CNNHD and the quality appears to be HD. This functionality more closely matches the auto tune to hd that our Contour cable boxes have.
Greg P
Cox Forums Moderator