According to the comcast forums, one employee and wikipedia shows are at most broadcast in 1080i. So they're usually 720p or 1080i.
With the exception of on-demand programming which can sometimes be broadcast at 1080p. Apparently, they cite cost as the the reason that live streaming of 1080p signals hasn't been adopted yet.
With the exception of on-demand programming which can sometimes be broadcast at 1080p. Apparently, they cite cost as the the reason that live streaming of 1080p signals hasn't been adopted yet.