Maybe by naming the channel Fox League they've left it open to be used as a Rugby League channel instead of just an NRL channel.
Maybe they're hoping that they can pick up some other international competitions TV rights on the cheap and that they'll get pretty good ratings for them by using the new channel as a basis for them.
Maybe They'll attempt to get the Australian broadcasting rights to any internationals from around the world that are televised, maybe they'll try to get the rights to the Toronto Wolfpacks' games, Championship (if it's televised), the French Competition (if it's televised), etc.
Maybe they're looking into having an NRL 360 style show for the game outside of the NRLs' borders. Maybe they're looking into expanding their coverage of the Qcup and NSWcup to televise more of those competitions matches.
I know I wouldn't watch mostly repeats in between the rounds of the NRL, which seems to be Fox Footys' modus operandi, but I'd watch as much of that as possible.