English Wikipedia is adding short descriptions, eventually to all articles. These may be useful for page reviews once WMF has disabled the use of short descriptions drawn from Wikidata. The short description is an annotation to the article title, which when done correctly, should provide a one-line indication of article content. Cheers,
Topic on Talk:Page Previews/Flow
page previews tend to be longer than short description though. Short description is one liner, a disambiguator of the title. A page preview (or rather text extract) is the size of the first paragraph of the lead of the article, a google top result blurb or the size of what Alexa/Siri might answer you.