Twitter has been a supporter of the Progressive Web App platform for some time, and it brought its service to the Microsoft Store on Windows 10 over a year ago. The PWA was also served to those visiting its mobile website, and we knew that it would eventually become the default for desktop users. Today is the day it happens, at least for some people.
Using its own platform, Twitter has announced that the new desktop experience is here, though as of right now, it doesn't seem to be available for everyone. In its release notes page, the company says that it's begun rolling out the new design, so it's possible you won't see it just yet. Nonetheless, it should make its way to all users sooner rather than later.
Twitter Release notes
Twitter has been working on its Progressive Web App for some time now, serving it to mobile users and Windows 10 users through the Store app. Now, it's rolling out the experience to everyone.