I see your in the same place I am at... trying to decide which teams to work on.

I have a mix team, the standard protadin/shammy team, a 4x DK/Healadin team, a DK/retadin team and a 5 hunter (mixed specs and pets) team. Through in a couple of 80 druids that were used during leveling.

Based on how 85 is playing in beta currently... I think the protadin / shammy team will remain my primary team for dungeons/heroics. I will level the 5 hunters up simply because they seem really fun to play now due to the sheer burst.

My real issue is I am not sure how fast guild leveling will happen. This will have impacts on leveling each team, reputation, money, and crafting skill ups. Add in you have to build rep on each toon with the guild... and I will probably be focusing on maxing out my guild level exp each week at the same time as leveling up 2 or 3 teams on rested at once. I did the speed level effort of my main team when Wrath launched. It was fun but I am not going to be in so much of a rush this time. I also know that there are some serious bottlenecks in the first two zones in Cata. I hit a 30 minute wall on one quest due to all the people in my batch on the beta hitting the same spot at the same time.... Also the number of required collection quests will temper your pace if you push to 85 without rested exp bonus.

I will say that you should also keep those priests in mind, I plan on bringing up my lvl 60 Spriests soon. The class/spec seems much more fun to play with the new mechanics.

There are a lot of variables around this time that have me a little unsure that boosting to 85 immediately is as worth it as it was last exp pack. Of course I will not be taking a week off this time so that has an impact on my choice too.