WordPress 3.4 is here. They have dubbed this release “Green” in honor of guitarist Grant Green
This release includes significant improvements to theme customization, custom headers, Twitter embeds, and image captions.
The developers say that the main changes are …
The biggest change in 3.4 is the theme customizer which allows you to play around with various looks and settings for your current theme or one you’re thinking about switching to without publishing those changes to the whole world. For themes that support it, you can change colors, backgrounds, and of course custom image headers. We have more planned for the customizer down the road.
Throughout the rest of the admin you’ll notice tweaks to make your everyday life easier. For example, if you have lots of themes we’ve made it quicker to browse them all at once without paging. We’ve made it possible to use images from your media library to populate custom headers, and for you to choose the height and width of your header images.