Last week WordPress 4.0 was released. An update without major changes, although -in their own words- “this release brings you a smoother writing and management experience we think you’ll enjoy”. For us the main changes are the improved Media Library and some improvements to the text editor. More here: wordpress.org/news/2014/09/benny/.
WordPress 4.1 is planned for a December release. The last update of the year always is accompanied by the new default theme. (A WordPress theme is the template that makes the website layout what it is.)
In my experience the default WordPress themes follow developments and trends in web design from a safe distance. Good to see that simplicity and focus are continued in Twenty Fifteen.
Here is a first look: make.wordpress.org/core/2014/09/09/twenty-fifteen/