GTK+ 2.8.0 has been released. You can download it from here, and read the release notes here. GTK+ 2.8.0 depends on the Cairo vector graphics library for rendering most of the GTK+ widgets, bringing graphics capabilities as antialiased shapes, alpha blending, and gradients.
Source : OSNews
If anyone is planning to download and compile this anytime soon, do report on any speed changes due to the Cairo library.