When users tap on the open book icon while browsing an edition section/article, the user is presented with a vertical scrolling list of available articles in the edition. If there are more items than currently shown, the last item will be called "More in [edition name]".
On Android, tapping this "More in [edition name]" item will just re-open the current section in a new section activity. On the iPad however, tapping the "More in [edition name]" item will append more items to the list and the user can continue scrolling through more articles.
Happening on Currents running on the Nexus One (passion).