The official WordPress blog posted up a sneak peek into the WordPress 2.5 release, with updated interface thanks to Happy Cog. A customizable dashboard, multi-file upload, built-in galleries, one-click plugin upgrades, tag management, built-in Gravatars, full text feeds, and faster load times will make our lives so much easier.
As Matt says the software is basically done and stable, and could be released , but they’d like to incorporate feedback from a wider audience before making it available to the general public. Until then you can download new and install Release Candidate 1 of WordPress 2.5. And here are some previews of it.
Write and edit
And if you still don't like the new deicing you can choose some of these
And further reading http://astheria.com/design/evaluating-the-wordpress25-interface