I would be happy with the following:
1) improved functionality within the notes field.
2) then have a smart folder for saved searches
Here is an example, say that my boss Michael Scott wants a report on some of my projects, but not all of them. I could drag Michael's vCard into the project and then have a smart folder to find anything that is associated with Michael. I currently try to do this with folders, but I think a saved search would give more precise control.
A new view would be nice, but I don't think it would be necessary. In the meantime, I'm just adding my own tags to the metadata e.g. &michaelscott and it is working well.