Many news are here. Among other things, Joomla 3.5 full support for PHP / that makes your site twice as fast just by making sure that your webhost run this. We have seen pages that were three times faster by just PHP7.
Anonymous reports are now sent also to Joomla so that they get into more details about what the problem hardware and what is installed in various Joomla installations around the world.
Images can now drag and drop to upload many simultaneously. TinyMCE is also the latest version with a lot of improvements. Read more at www.joomla.org