I haven't checked the Northrend instances yet, so don't know if they have them too.
Going to check now.

*edit*
Changed the title, cause both Northrend and Outland instances has quest givers inside the instances now.
It looks like there's new quest rewards too. I'm not sure about this, cause I checked on an alliance character in Northrend, and I haven't really levelled alliance characters that much, so I don't know if you can get the rewards from other quests.