Comcast launches beta for using your Roku like a cable box

Starting today, Comcast is letting its customers use a Roku as a secondary cable box. If you’ve got a Roku streaming device “released in the last couple years” — or a Roku TV — you can download the Xfinity TV app beta from the Roku store and give the experience a test run before it widely launches later this year.Eventually the plan is to let customers replace their cable box (but not a cable subscription, obviously) with a Roku if they so choose. But during the bet