If you were to choose a combination of already released WoW content, what things would you want to include into your custom made expansion from content all the way from classic to SL? Make a list of features, but they have to be already released/existing WoW content, not imagined or desired changes.
Edit: adding an example
Nice list - this is what I was hoping to see. But you forgot to include my #1 favorite from Legion, Mage Tower