dev-libs/glib-2.16.4 was released on 2008-07-01. x11-libs/gtk+-2.12.11 was released on 2008-07-01.
Yes we know... Gnome has mailing lists and RSS feeds for newly released packages... Are you opening a bug just because you want the greatest and latest or because there's a specific patch you need?
glib-2.16.4 is now in portage, fyi
Fixed.