WordPress 3.8.1 Maintenance Release is now available. You can update using your WordPress Dashboard!
WordPress 3.8.1 Bug Fixes:
-Embedding tweets
-WP_Query fixes
-Themes screen fixes and improvements
-Fixes for the new dashboard design
-Responsive admin fixes
-The new dashboard widgets
More info about WordPress 3.7.1 at http://wordpress.org/news/2013/10/wordpress-3-7-1/