@chasemp: You might hate me as this is another thing I had not thought about (sigh): Potentially importing component descriptions.
Seeing e.g. /tag/mediawiki-internationalization/ in the preview instance with an empty description, how complicated (how many days of work?) would it be to import the component description
Issues relating to internationalization, localization, translation, and the MediaWiki namespace.
http://www.bugzilla.org/docs/4.4/en/html/api/Bugzilla/WebService/Product.html lists get_accessible_products() > components > description
And likely the same for Bugzilla keyword descriptions (though that is a number that I could still totally enter manually after the migration if it saves some time).