The new big thing is application modernization, which basically means decoupling the various features or "facets" that make up UWP (e.g., the packaging and installation format aka AppX/MSIX, the XAML UI framework, the Windows UI contracts like Share, the AppContainer sandbox, the Store, etc.) from each other, and allowing/encouraging existing Win32 applications to adopt each of them independently of each other.
Depending on how you look at it, you could call this "abandoning UWP" since they are putting less energy into promoting UWP as a whole and more into promoting its component technology. OTOH, most all of the new stuff originated as part of UWP, and if your app adopts all the pieces, you have a UWP app.
If you're curious about the "new" stuff and where they are going with it, their conference last week had a good overview:
https://myignite.techcommunity.microsoft.com/sessions/64519?source=TechCommunity
BTW, PWAs on Windows are UWP apps. They use the same sandbox, etc., and all the pieces above except for the XAML UI framework (which was never an essential part of UWP as they always supported web tech based apps as well)