WordPress 3.6 is currently in beta. The full release has been scheduled for April 29th, 2013. Beyond bug fixes and performance tweaks, here are some of the things that we’re currently looking forward to seeing in this core update.
For those of us who write our draft posts directly in WordPress, the 3.6 release will fine tune the Post Revisions feature. Changes to the visual interface will allow the author to get a quick visual overview of the changes that have been made to a post.
Autosave and Post Locking
Posts will autosave to local storage, preventing data loss if the login cookie expires or during the interval between saving versions to the sever. Post locking would prevent data loss if two editors were logged in and editing the same post (currently there is a simple warning).
The tabbed menu area of the WordPress Admin was confusing for some, so accordion style menu items will likely be part of the version 3.6 release. Better right-to-left (RTL) language support and cross browser capability are also expected in the core update.
Native Support for Audio and Video
This one sounds better than it is. A native, HTML5 audio and video player is great, but because of a lack of standardization across even the most current versions of web browsers, you must continue outputting video in multiple formats (mp4, ogg and webm).
You can keep up with the very latest regarding the WordPress core here.