Red Hat employee and member of the GNOME foundation Cosimo Cecchi, explained yesterday through his blog, the various improvements that the GTK 3.4 release brought for the GNOME users, and the work that is being done on the next 3.6 release.
The most important GTK 3.4 improvements are the support for most of the properties of the CSS3 backgrounds and borders family, linear gradients and the long requested inactive windows theming feature, which is showcased in GNOME 3.4.
What is coming round the corner is the implementation of support for transitions and CSS animations that will make GNOME 3.6 look cooler than ever!