Home Box Office has updated its HBO Go app to version 2.1, adding background AirPlay streaming that lets users pass video onto TVs and other devices using AirPlay while making the mobile device free to run other applications. The update adds general performance enhancements as well as some additional interactivity for Game of Thrones watchers: while the episode is streaming to another device, users can see additional content (mostly text- and photo-based) on their iPad, iPhone or iPod touch.
