Yes the new one can play music files off a USB drive. In fact, there is no longer a strange adaptor cable in the center console. The plastic tray is gone as well! (the one that you used to have to lift out in order to access the Aux and Ipod connecotrs) Instead there is a USB plug which makes it much easier to plug in a Nano or Iphone. I guess that is what I'm going to have to do if there is no longer a hard drive...
I just checked out Youtube and the 2013 370z does not have a Music Box tutorial video. I found videos for the 2012 so I know that model had the feature. There are also 2013 videos for other features... but it seems that Nissan pulled a fast one on us with the missing Music Box. Very odd indeed...