As I understand it "FreeSports" is part of the same company that owns "Premier Sport".
I imagine it will be like a "taster" channel, so will show some NRL to get you interested then the Play-Offs / GF / SoO will be advertised heavily as being exclusive to the subscription channel.
Premier sports is the best £100 i spend all year. All the world cup games, aukland 9's, SOO, anzac test and every NRL game. Great value. I know that people say the Nrl is dull but the skill on show and intensity is on a different level. I would pay that money to watch 3 SOO games and Semi Radrada every week