WordPress 3.0 arrived yesterday with a lot of improvements and new features. It is WordPress’ major release so this version isn’t automatically updated to your site, you will have to initiate the update. Here are some of the new features: TinyMCE has some major improvements like the drag and drop image uploads, drag and drop files, live gallery previews, resizing images in post editor, plain text editor buttons, and you can copy and paste directly from MS Word. New Theme Screen The new interface for themes was developed separately as a part of THX38. In WordPress 3.9, Add New Theme is prettier and more user friendly. Searching for WordPress themes is a lot easier now.
Read the rest of the updates here: http://www.wpbeginner.com/news/whats-new-in-wordpress-3-9/