The date for the release of WordPress 3.9 has now been set. It coincides with tax day in the US, so if you are an American developer, better do your taxes early as on April 15 you’ll be busy with the update.
Expect that in WordPress 3.9, you’ll benefit from a Widget Customizer plugin that will have live previews of widgets as you customize it. Better Widgets plugin will also make it to the 3.9 updte.
In addition to that, audio/video, and theme browsing to the theme installer will be available in 3.9.
Read the rest of the post here: http://wptavern.com/tax-day-release-wordpress-3-9-to-drop-on-april-15