WordPress 3.4 Beta 1 is out

WordPress developers have released the first beta of their next major update.

WordPress 3.4 Beta 1 is now available for download and testing.

WordPress 3.4 Beta 1 is out

Developers are suggesting not using this build on production sites.

This update seems to be focused on theming support enhancements:

Theme Customizer with Previewer
Flexible Custom Header Sizes
Selecting Custom Header and Background Images from Media Library
Better experience searching for and choosing a theme