There won't be a successor to the Dell XPS 15 9575 released in 2019. The popular 2-in-1 convertible laptop was released in the first half of 2018 and there seems to be plenty of people who are expecting the American manufacturer to offer a refreshed or upgraded option for this year. But that will not be happening.
https://www.notebookcheck.net/Dell-has-no-plans-to-release-a-new-XPS-15-convertible-in-2019.420290.0.html
Bravo Dell, bravo! Firs try to fix XPS 15 9570 :D