WordPress version 3.9 is now available for download. This new version really makes working with media a lot easier.
Here are a few things you will notice:

• Updated visual editor
• Easier image editing
• Gallery previews (yay!)
• Audio/video playlist capabilities
• Widget/header live previews
• New theme browser
• Updated JS libraries (and other fun changes for developers)

You can read more about the update: http://core.trac.wordpress.org/query?status=closed&group=resolution&milestone=3.9

You can download WordPress 3.9: http://wordpress.org/wordpress-3.9.zip