They've kept the same spine, just made some changes in the backs and engine room. The positives for this side are that the spine at this stage know each others game and could predict what the others have planned just from body language. Dropping some aging players and replacing them with youth could go either way. It was inevitable that they'd have to do this soon anyway. Doing so with the series on the line looks like a bit of desperation but if they have chosen well it could be a masterstroke.
At the end of the day though I think that even with the superior spine that qld have had during their great run, the fact remains that quite a few crucial series wins have come from referring decisions that we're hugely questionable. I'd say that game three last year was the culmination of my time watching origin. For the first two games the trans were allowed to belt each other. In the third game I thought about ten minutes in that they ordered NSW to put skirts on this nullifying the advantage they had developed with the forwards. I'm convinced that gambling was at the heart of it. I'm not usually prone to these type of conspiracy theories, but during the last season or two I've seen plenty of things that made me jump to the conclusion that at least a couple of matches each week are fixed. If multi betting is going to cost gambling agencies a lot of money they can fix one or two games which would kill the majority of multi bets. I hate thinking that the sport is no longer fair, but logic tells me that it isn't and when it comes to origin it's been going on for a few years.