StarWars.com just announced that Star Wars: Rebels will premiere with a one hour movie special called "Spark of Rebellion," Friday 3 October 2014 at 9:00pm EST on the Disney Channel, United States.

DisneyXD subscribers will be able to view the special Monday 29 September online or on the DisneyXD app, where I assume subscribers will be able to watch all episodes free after airing. Otherwise, non-Disney XD subscribers will need to purchase episodes through the usual locations (Amazon, Google, iTunes). Also...the internet...

Star Wars: Rebels will air on Disney XD Monday nights at 9:00pm EST starting Monday 13 October. Again, all of this information relates to United States channels and scheduling; stay tuned for details on local carriers.