It just appears like they have included the Library Folders (Desktop-Documents-Videos-Pictures-Music, etc) in the main Explorer Window, but at least it can be customized.
I am still using 8, and only my Drives are listed in there. My Library Icon is on my Taskbar and I get to the Library that way. Another reason why I'll stick with 8 and pass on 8.1. Maybe I'll change my mind once the real version of 8,1 is released- But I've "Previewed" 8.1 as much as I am gong to for now.