The device is similar to MiraCast - it's not like Roku that streams the content itself. It's purpose is to connect to a tablet, smartphone or computer and display content from those devices (e.g. from YouTube, Netflix, Pandora (coming soon), Google Play Movies, Google Play Music and Chrome)
Presumably additional apps will have support added and since it has an SDK in theory any app developer (games?) can add compatibility.
Not all handheld devices support HDMI out so this is a generic screencast solution.
