Brothers - A lot of history there. i don't know too much about their bid, I don't even know where they are located these days. They used to be in Bray Park, way out northside brisbane way when I was growing up.
Dolphins - Probably the biggest and most successful team in the Qld cup. Have a large leagues club and a pretty decent stadium. Not sure if a team named after Redcliffe will get much support outside of the peninsula though...they might have to call themselves moreton bay or brisbane dolphins or something.
central qld - Population is too decentralized. Rockhampton is the largest city (town) and doesn't even have 100k people. They would struggle both for fans and corporate support.
Western Corridor - Growing area that incorporates Ipswich, Springfield and all those suburbs out that way. Jets are a popular team. They're on the right side of town to best utilize suncorp stadium. Only problem is that I reckon a lot of people out there are already Broncos fans. Alfie and the Walters brothers are all from Ipswich...
Bombers - Looks like a well organized bid. They may be plastic but kids won't care about that and the idea is to get long term support, not immediate support based on nostalgia.