On August 1st Matt Mellenweg announced that WordPress, version 3.6 known as “Oscar” and the new Twenty Thirteen theme, are now in general release. With 1.5 million downloads in less than a week, Twenty Thirteen broke the records of previous releases. For a complete list of features go to: http://wordpress.org/news/2013/08/oscar/.
For one of the best reviews of the Twenty Thirteen Theme features and what makes it different from its predecessor visit Thematosoup