"A few weeks"? "Later this year"? Don't worry about Comcast's recent meddling with the fine print, Xfinity TV's latest update for the iPad allows you to "play movies and TV shows anywhere and anytime on your iPad using a Wi-Fi Internet connection." The deal is for select networks (aka not everyone's on board to start) including HBO, Starz, Showtime, and Cinemax. Version 1.1.1 is now available; we're downloading now and will let ya know exactly what we find.
