The new 13.3-inch Latitude 5300 series will offer a larger screen size than the 12.5-inch Latitude 5290 series while being thinner, lighter, and smaller due to having narrower bezels. It's likely that Dell will put the 5290 series on hold or even discontinue it altogether because of this reason.
https://www.notebookcheck.net/Dell-drops-the-Latitude-5290-series-replaces-it-with-the-Latitude-5300-and-5300-2-in-1.419722.0.html