How the page appears
Attached is a screenshot of a File page that was imported from Commons before InstantCommons was enabled. After InstantCommons was enabled, the content of the page appears to be there twice. However, opening the page to edit it shows that there is only one copy of the page.
The lower section of the page is clearly directly from Commons since, for example, the link to the "Software" category is not redlinked and, in fact, takes you to http://commons.wikimedia.org/wiki/Software instead of http://commons.wikimedia.deployment.wmflabs.org/w/index.php?title=Software&action=edit&redlink=1 like the first link (which is visible in the screenshot).
Page history also shows only two revisions, the first is from the import (04:53, 11 January 2012 MarkAHershberger) and the second is from a bot doing categorization (13:34, 24 October 2011 MGA73bot2)