Creator is one of several fields. As mentioned in the first post but perhaps not very clearly is that "title" and "creator" is only two of several Dublin Core Entities just as it is today. The right pane will probably require a scrolled window to fit the entire form already available today.

Below is the definition of "Creator" in this case.
http://dublincore.org/documents/2012/06/14/dcmi-terms/?v=elements#terms-creator