I mean, they've shoved them on GitHub, but are they still doing any significant work on them? My impression was the WPF at least had kind of been in limbo for years.
Not trying to sound facetious, but does WPF need any other significant work? It's a UI framework for Windows desktop apps (narrow and specific scope), it's stable and "just works", it's well-documented, it's officially supported, etc. Does there need to be anything else, or are we looking at it from the POV of more "modern" UI frameworks, where no active churn == languishing on the wayside?