RING is still a project very much under development. Since PHP-Gtk2 itself is under development, progress in RING's development goes hand-in-hand with that of PHP-Gtk2. You can subscribe to the PHP-Gtk2 mailing lists to know more.
I welcome any help in the development of RING or PHP-Gtk2. If you would like to offer any kind of assistance in the project, please mail me: anant[at]kix[dot]in.