Version 3.8 of WordPress, named “Parker” in honor of Charlie Parker, bebop innovator, is available for download or update in your WordPress dashboard. We hope you’ll think this is the most beautiful update yet.
WordPress has gotten a facelift. 3.8 brings a fresh new look to the entire admin dashboard. Gone are overbearing gradients and dozens of shades of grey — bring on a bigger, bolder, more colorful design!
Modern aesthetic
The new WordPress dashboard has a fresh, uncluttered design that embraces clarity and simplicity.
Clean typography
The Open Sans typeface provides simple, friendly text that is optimized for both desktop and mobile viewing. It’s even open source, just like WordPress.
Refined contrast
We think beautiful design should never sacrifice legibility. With superior contrast and large, comfortable type, the new design is easy to read and a pleasure to navigate.
WordPress on every device
We all access the internet in different ways. Smartphone, tablet, notebook, desktop — no matter what you use, WordPress will adapt and you’ll feel right at home.
High definition at high speed
WordPress is sharper than ever with new vector-based icons that scale to your screen. By ditching pixels, pages load significantly faster, too.
Refined theme management
The new themes screen lets you survey your themes at a glance. Or want more information? Click to discover more. Then sit back and use your keyboard’s navigation arrows to flip through every theme you’ve got.
Smoother widget experience
Drag-drag-drag. Scroll-scroll-scroll. Widget management can be complicated. With the new design, we’ve worked to streamline the widgets screen.
Have a large monitor? Multiple widget areas stack side-by-side to use the available space. Using a tablet? Just tap a widget to add it.
Source: http://wordpress.org/news/2013/12/parker/