Changes in elementary GTK theme 3.0 since the previous stable release:
- GTK3 support, including :backdrop class, but there's no dark theme yet
- elementary now uses the Unico GTK3 engine
- Granite support (which is used by many applications that will be default in the elementary OS Luna, such as BeatBox, etc.)
- Dropped GTK2 classes for GTK3 apps so there's no more support for applications like Nautilus elementary and others (so any application that has a GTK3 version doesn't have support for GTK2 anymore)
- The default placement is now close:maximize
- The maximize button has been changed from the "+" (typically used to mean new) to two opposing arrows
- More
Download elementary GTK 3.0
To install it, extract the downloaded archive and copy the "elementary" folder to the ~/.themes directory (if it doesn't exist, create it) for your user or under /usr/share/themes/ to make it available for all users (and applications ran as root).
Report any bugs you may find @ Launchpad.