This has been covered in a number of threads over the past couple of days, but here you go:
Graham Annesley was on ABC radio yesterday and one of the things he covered was the system for allocating finals for 2007 onwards.
It can basically be summed up as:
Week 1: Home Venues
Week 2: Home Cities
Week 3: Home Regions
Annesley clearly stated (or at the very least he implied) that the third and fourth highest winners from week 1 would earn a final in their home city in week 2. It wasn't crystal clear from what he said, but presumably the first and second highest winners from week 1 would earn a final in their home region in week 3.
From what Annesley said, you'd expect the following venues to be available for the weeks 2 and 3.
Week 2 - Home Cities:
Aussie Stadium, Sydney
Telstra Stadium, Sydney
Canberra Stadium, Canberra
EnergyAustralia Stadium, Newcastle
Olympic Park/New Stadium, Melbourne
Mt Smart Stadium, Auckland
Suncorp Stadium, Brisbane
Dairy Farmers Stadium, Townsville
Carrara Stadium/Robina Stadium, Gold Coast
Annesley specifically ruled out WIN Stadium (St. George Illawarra home finals in Week 2 would be played at Aussie or Telstra Stadium) and I'm not completely sure but I think he ruled in Canberra Stadium for week 2. Perhaps a Gold Coast home final would be scheduled for Suncorp Stadium, but I imagine if Canberra Stadium and EnergyAustralia Stadium are acceptable for week 2 I see no reason why the new Robina Stadium wouldn't be. Annesley said that the NRL would consider Telstra Dome for week 3 if it was available, implying that in week 2 the smaller Olympic Park or the new stadium would be considered appropriate.
Week 3 - Home Regions:
Aussie Stadium, Sydney
Telstra Stadium, Sydney
Olympic Park/New Stadium/Telstra Dome, Melbourne
Mt Smart Stadium, Auckland
Suncorp Stadium, Brisbane
Dairy Farmers Stadium, Townsville
Annesley said that the test for week 3 'regions' was if fans of the team that has earned the home final could get there relatively easily. I cannot recall the exact phrase he used, but it was something to that effect. I'm quite sure that he implied that Canberra and Newcastle would be expected to get to Sydney for a week 3 final but he definitely pointed out that the distance between North Queensland and Suncorp Stadium was too great and therefore North Queensland would be considered a seperate region to Brisbane and the Gold Coast. See above comments for Telstra Dome. If the expercted crowd were big enough to justify it, perhaps the NRL would consider the larger Eden Park in Auckland for a New Zealand Warriors home final in week 3.