Yes, it's there -- but. In Word 2010, there's a non-editable print
preview in the Print tab of the File (a.k.a. "Backstage" pane), which
has no ribbon/toolbar. In order to get the editable print preview,
which does have a ribbon, you have to add the Print Preview Edit Mode
button to the Quick Access Toolbar or to a custom group on the ribbon.
This is almost completely "undiscoverable" and is going to need a page
at mvps.org.