Xfce4-settings 4.13 is out and is a development release for the 4.13 series. This initial release marks Xfce Settings being fully-ported to GTK+ 3.x. That's the main change with this release is the port from GTK2 to GTK3 but some bugs do remain. There are some screenshots via this blog post.
Xfce4-notifyd 0.3.4 is also out and a new feature is supporting a "Do Not Disturb" mode whereby notifications are suppressed for certain applications as to not bother the user.
Also recently released was xfce4-genmon-plugin 3.99.0 as ported to GTK3, xfce4-dict 0.7.99 also did porting to GTK3 and other modern interfaces, more features in xfce4-mpc-plugin 0.5.0, and more. Other plug-in updates this month with GTK3 support considered stable are xfce4-systemload-plugin 1.2.0, xfce4-datetime-plugin 0.7.0, xfce4-diskperf-plugin 2.6.0, xfce4-fsguard-plugin 1.1.0, xfce4-netload-plugin 1.3.0, xfce4-smartbookmark-plugin 0.5.0, and xfce4-wavelan-plugin 0.6.0.