What kind of new packages would spawn from the introduction of PGTK?
This video discusses the work on pure gtk: https://www.youtube.com/watch?v=LPwr8WeE8jU . I found it by following this story. It talks about Emacs essentially becoming a GTK widget and possibility of nesting GTK widgets in Emacs. I'm not fully aware of what they will lead to.
Oh, that is extremely interesting!! It would be great to hear more about this!