When WordPress released the new looking 3.8 it had over 9.3 million downloads in just six weeks, quiet an amazing number and just shows the popularity of the WordPress blog. If you have your blog set to auto update then you will already be running WordPress 3.8.1 by now, if not then you can easily update it from your admin panel with just a click of the mouse – Dashboard → Updates and simply click “Update Now.”.
This is a maintenance release and not a security release so it’s going to fix some of the bugs that were reported.
http://wordpress.org/news/2014/01/wordpress-3-8-1/