I did manage to get one more toon safely established in Northrend this past week, with the Shaman being the latest to join the club. It now remains just for the rogue to make the final push. He's sitting at level 65 and questing through Terrokar Forest, so I'm really hoping to get him the rest of the way by the end of the day tomorrow.
I've also been messing around on the beta a fair amount and have started to level a couple of toons through Hyjal and Vash'jir just to see the content. The quests so far are remarkably well put together and its very easy to follow the quest chains and breadcrumbs through both zones. The quest rewards seem very good, especially if you're hitting those zones in quest greens and blues from Northrend. It's hard to tell on some of them how good they will be because the mastery stat isn't fully implemented yet, but I did manage to get a staff for my warlock that was a clear upgrade to the Seethe / Shriveled Heart combination that he was rocking.
I've also had a chance to take some initial attempts at two of the new instances - Blackrock Caverns and Throne of the Tides. It looks like both will require some significant nerfing before release if players coming straight out of Northrend are going to have any hope. I have seen a ton of groups wipe time after time with the entire group being in full T-10 / ICC gear. The mechanics of the second boss in Blackrock Caverns in particular seems to get the best of everyone - it seems that folks haven't had to worry about standing in beams since Outland!
In any case, I'm trying to balance continuing to work on leveling my toons with experimenting with the beta. It is getting harder and harder to remain focused on the pre-Cataclysm stuff with so much new goodness out there to try!
So, as a general update. Both the mage and priest are sitting at 71. The shaman is sitting at 68 and has just started questing in Northrend. The rogue is sitting at 65 and will hopefully be visiting the shores of Borean Tundra within the next day or two!