The latest version of WordPress is about to get released. This is not a big update, only few improvements on the user interface. For example, now you have more control from the administration panel on the template you are trying to edit. Now it is possible to make changes to a theme and preview it, but the changes won’t be visible to your visitors until you finish all the changes.
There are other small improvements in different areas of the administration panel. The most improvements are made on the code from the back, that most people never used. Some work have been done on the XML-RPC, themes and custom headers API. Also, they made optimisation and we will be able to see performance improvements on WP_Query and to the translation system.