A little over a month ago is when I got interested in multiboxing, so I made 5 retail accounts and started learning how to use ISBoxer (the main multiboxing software). I'm still very new to it and learn new stuff constantly. I can definitively say that I'd be screwed if I wanted to multibox (to my standards) on release with minimal knowledge or practice. There's just way too many things to learn and it takes a long time. If you're going to do this I recommend practicing it first because it is a LOT of work to learn, setup, maintain, and execute properly - which you probably won't want to take the time to do once classic has already arrived. If you're simply leveling some teams to 35 then it won't be too much work though. However I am planning on 5 manning dungeons at 60

And yes you can do lots of aoe dungeon grinding as a multiboxer

The fastest team to level 35 would be either 5 hunters or a dungeon grinding team (melee cleave or spell cleave), but a dungeon grinding team takes a lot more planning, setup, and practice.