The new version of the wordpress is out, for those using the wp 2.5 the upgrade is painless, no major changes in skins and the plugin system. Here is a list of the new features

• Post Revisions: Wiki-like tracking of edits.
• Shift Gears: Turbo-speed your blogging.
• Press This!: Post from wherever you are on the web
• Theme Previews: See it before your audience does
• Word count! Never guess how many words are in your post anymore.
• Image captions, so you can add sweet captions like Political Ticker does under your images.
• Bulk management of plugins.
• A completely revamped image control to allow for easier inserting, floating, and resizing. It’s now fully integrated with the WYSIWYG.
• Drag-and-drop reordering of Galleries.
• Plugin update notification bubble.
• Customizable default avatars.
• You can now upload media when in full-screen mode.
• Remote publishing via XML-RPC and APP is now secure (off) by default, but you can turn it on easily through the options screen.
• Full SSL support in the core, and the ability to force SSL for security.
• You can now have many thousands of pages or categories with no interface issues.
• Ability to move your wp-config file and wp-content directories to a custom location, for “clean” SVN checkouts.
• Select a range of checkboxes with “shift-click.”
• You can toggle between the Flash uploader and the classic one.
• A number of proactive security enhancements, including cookies and database interactions.
• Stronger better faster versions of TinyMCE, jQuery, and jQuery UI.
• Version 2.6 fixes approximately 194 bugs.

Here is a brief video tour of 2.6, it doesn’t show everything but it’s a good start to see what’s new