Super Stations are not available to all clients. It looks like if you have 'english' programming you will have it and if you have 'french' programming you won't have it.These are rebranded stations that are in free preview for the month of August.
Discovery World HD (formerly Discovery HD) 279/360
The Cave (formerly MenTV) 570/277.
Also still in free preview are the Super Stations 651-654/271-274, Oasis HD 258/366 and WFN 458/127.