At https://www.mediawiki.org/wiki/Topic:S7sldbsp3nlpykbd NunoAgostinho writes:
What if we could include more information into Hovercards depending on whether we're displaying an article referring to a person, an event, a movie, a TV show, etc.? Basically, we could include extra information in Hovercards depending on the category of the article. The best example I can give is for people's date of birth and death, which is removed in the Hovercard preview because it's usually contained inside parenthesis. Check the following examples I've created to see how this could be implemented.