"which will be edited by approved contributors selected through an internal review process"

That's not a wiki, people keep co-opting that term. Wikis by nature are editable by everyone. Sites that are editable by "approved contributors" have been around since approximately forever, that's like saying my blog is a wiki because I'm the approved contributor on it

"Faculty at Harvard Medical School will be contributing un-editable seed content to the site. [...] Other academic institutions will be also contributing to the Medpedia Project, [...] though all of the content that they provide will be editable."

Ooh, Harvard has just invented Knol for medicine.