Pretty much. Love AU Draenor though, gorgeous setting. But Outland is one of the most interesting set pieces Blizzard has created. It makes absolutely no sense but certain parts of it (the Netherstorm in particular with the Manaforges and the Biodomes) I would love to see reimagined in HD.
However new models have been added by substitution in many zones of the old world that have not themselves been changed.