With the hovercards beta feature enabled, hover over the enlarge/magnify icon (two gray rectangles) below a thumbnail image, e.g. the ones in https://en.wikipedia.org/wiki/Sparrow
Result: every icon pops up a hovercard containing only
Enlargement may refer to: Last edited 6 months ago
It's showing a hovercard for the redirected enwiki disambiguation page [[en:Enlarge]], I guess because that's the title attribute of the hyperlink:
<a title="Enlarge" class="internal" href="/wiki/File:Russell_as_a_boy.jpg" data-original-title=""> <img height="11" width="15" alt="" src="//bits.wikimedia.org/static-1.23wmf22/skins/common/images/magnify-clip.png"> </a>
There might be a role for a hovercard to display meta information about the image (talk to Multimedia team?), but probably not on the enlarge icon.