Here's the new update in action:
You can grab or update the Twitter PWA-ified UWP client here in the Store. Enjoy night mode, enjoy the 280 character compatibility and tweetstorm feature, enjoy the new Explore layout and functionality, but it's still not as slick or as fully featured as the commercial third party client, Tweetium UWP, which offers every feature under the sun, right up to push notifications, and which I've been recommending for the last couple of years.