You can walk around the Aleroth level in the editor, called "Aleroth_Div1." Pretty sure that hasn't been there for very long. There's no NPCs or anything, but it's a pretty cool looking town.
didnt they show (or at least tell) in some kickstarter video that they remade aleroth just to show the power of the editor? and i do not mean the video in which they remade the butcher level of diablo1.