The Apple TV Streaming service will also be available but not until November 1.
This new Apple TV channel also includes other paid channels which can be subscribed to. So instead of having to subscribe from multiple websites or individual channels, they can all be managed from within the Apple TV App on Roku.
Here are the individual channels you can access all from within the Apple TV app on Roku
Add The Apple TV Channel To Roku
Comedy Central Now
Lifetime Movie Club
Urban Movie Channel