This is obviously new content that you get with the xpac. It is however also expected,Cheap WOW Gold On Sale since they would not add 10 new lvls and then disregard making dungeons. The new lvls, talents, abilities and dungeons are pretty much the same single feature. The raids however are not related to lvling, so I will gladly count those as actual new ingame content that the xpac provides us (even though raids too are a standard with every xpac).
They've been doing this since Cata(?), and is in my opinion a very cool/nice thing they're doing for us players. They are giving us a chance to see the old dungeons we loved, but with updated lore/gameplay mechanics.
Sadly, I can't count this is as xpac content either. They are taking existing dungeons and are just putting new mobs/events in them. If they were to completely overhaul the old dungeon it would be something I'd call worthy of an xpac, but then agian it would stop being a revamp aswell and just turn into a new dungeon. Still something I welcome, but similarly to the new models, players can/will be able to do these dungeons at lower lvl without needing WoD (even if it is the low lvl version).~~~~wly.com