VL usually implies Volume License so these are usually copies which can be activated many times but have a unique key. I've heard of Enterprise versions being VL but it seems rare that W8 PRO would be VL -- but I suppose in a business it's possible.
I think the N edition means it doesn't include the Media stuff which if you want it has to be added separately. However with service now being supplied directly from the Internet and free media players like VLC which can handle nearly every known codec in the universe the need for the Ms media stuff isn't an issue any more.
@brink -- you just beat me to it -- cheers jimbo.