No doubt everyone noticed the mailing list changes last weekend. Others might have noticed that there are now gtk-osx and gtk-mac-integration projects on git.gnome.org, and that there is now an "OSX Build Page"  on Gnome Live.
After some rather spirited discussion on gtk-devel-list , I've agreed to move the project to Gnome.org where the Gtk team seems to think it belongs. This is a rather slow process, in part because it takes some time to get all of the various parts set up and moved in an orderly fashion and in part because I have other things to do. The introductory web page will move soon (to http://www.gtk.org) along with the remaining wiki pages (to Gnome Live).