Ch9 are showing it at their usual 12:30am timeslot. WIN are showing it 5hrs earlier (either at 7pm or 7:30pm ... I forget which), while Imparja will be showing it live I'd assume, which will mean it can be watched at 4:30pm / 5:30pm live (depending on what the kickoff time is ... again, I haven't looked).
It would have been great had Ch9 shown the game live on GEM, however I guess that's too much to ask.
I was told by someone who knows that Ch9 were coming on board with us in WA (finally!) in 2012 and were going to give us a better deal. I wasn't told what their plans were, but I guessed it would involve the Friday and Sunday NRL games on at a decent hour on GEM as well as Origin live on their main channel. That was just my guesses though.