Well, I finally hit 70 last night, and I have already spent a bit of time on Northrend. I picked the Borean Tundra rather than Howling Fjord to start off with, but I have not done a lot there yet. I did enjoy driving the tank, though, as well as the ejection. I had one unplanned ejection in a rather difficult spot, but it all worked out. I simply mounted, rode back and got another tank.
I've gotten lots of skins, but no mining yet.