WordPress 3.8 is more of a cosmetic upgrade than a behind the scenes re-work of WordPress and with it comes a much improved visual interface in my opinion. The WordPress 3.8 dashboard more clearly delineates the admin area to the left of the Admin site as well as the top admin bar.
Theme wise, the Twenty Fourteen theme is slick and more magazine style than any of the previous default WordPress themes. There is a great deal of flexibility in configuring the theme and adding customizations and I like how the post separator is handled on the home page.
The number of default profile colors has been increased and now you can have 8 different default profile colors to choose to suite your mood or whatever color scheme is the most aesthetically pleasing to you. For those of you who manage multiple WordPress blogs having a separate color scheme for each blog can help you instantly recognize and remember which site you are on without having to look at the URL bar and will become instinctive in short order.
For me, Blue and Black are my favorite colors so I stuck with the default scheme, too much blue and not enough black with the blue, but I definitely did like the Coffee colored theme and it paired nicely with a food blog.
The widget screen has also been redesigned adding 3 columns of widget area’s so you can clearly separate out your sidebars from your header/footer bar areas. Less scrolling is needed to move between the various widget areas.
Mobile support and consistency is now part of the WordPress 3.8 admin theme, where the administrative interface is easier to navigate and use with better support for that mobile browser.
Have you upgraded to WordPress 3.8 yet? If you have, tell us what you like about it so far.