SQL Server 2012 Media by Edition and Licensing?

Hi,

I'm setting up a network install with the SQL Server 2012 media.  With past versions, I maintain media by edition and version.  In looking at the download page on the Microsoft Volume Licensing Service Center, I see SQL 2012 by edition and licensing model (core or server/cal).  We use server/cal internally and core for stuff linked to the public web sites.  Is the media actually different?  Also, do I still need to maintain separate media by edition? 

Can I use one version of the media and provide PID that will determine the edition and license model?  I use a commandline setup, so it would be easy for me to provide the PID.  We are mostly DEV and STD on the server/cal model.  ENT and core are more rare for us. 

Thanks

Randy in Marin