If you've got Comcast service and an iOS device, there's no reason you can't download the brand spanking new Xfinity TV DVR remote app right now, but it won't have the software's spiffiest feature -- direct-to-device streaming video. That's set to roll out in either "a couple of weeks" or "by the end of the year," depending on which Comcast representative you ask, and we got to try it for ourselves (along with the rest of the app) at the Web 2.0 Summit this week. Right now the featureset is fairly limited -- you just pick programs from a guide and either watch them, beam them to your TV, or tell your DVR to record -- but what is there was leagues mo