A new API for custom headers and backgrounds, flexible headers, live previews (the Theme Customizer), changes around XML-RPC and i18n and l10n. All of this and more in the WordPress 3.4 Field Guide for Developers.
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A new API for custom headers and backgrounds, flexible headers, live previews (the Theme Customizer), changes around XML-RPC and i18n and l10n. All of this and more in the WordPress 3.4 Field Guide for Developers.