I got to level 83 last night on the re-roll DK. I was telling Noc if I didn't have to work Saturday I could probably get to 90 by the end of the weekend. As it stands, I should definitely be 85 by the end of the night tomorrow and I can start Jade Forest after work on Saturday.
I've basically been staying in the LFD queue and questiong. I'm not even done with Hyjal yet, which will net me a nice amount of gold if I decide to go back for Loremaster at 90. If I had tank gear for the character I would finish Hyjal and then get to 85 via dungeon runs and mining. I'm still something like 13 mining skill points shy of being able to mine in Pandaria.