Announcing the release of Fedora 15 Alpha

gtk3 is not a new codebase. Its gtk2 with some backwards-incompatible changes and the internals of structs sealed up, if my understanding is correct. 'gnome 3' is most of the gnome apps updated to use gtk3 & other newly blesses technologies (dconf instead of gconf comes to mind). In addition the default shell has changed to the new gnome shell from the panel, which is what most people take issue with, as it has many knobs found in the current version of gnome removed (maybe these are removed from gnome-*-properties apps? I'm not sure).