We been working on the 3.5 branch for a while and it was time to release a first beta of that code. It includes some new features that have been requested by the community.

It also contains some internal changes to boost performance since this release includes a lot of new features and major changes to some of the internals we release this as a beta release.

Rewritten noneditable plugin
We decided to rewrite the noneditable plugin from scratch since the old one had some issues with nested editable contents and was a bit tricky to use. The new logic makes it easier to handle nested editable regions and inline noneditable blocks of text like variables/placeholders.

Here is a demo of the new noneditable plugin:
http://www.tinymce.com/tryit/noneditable_content.php

HTML5 support and visualblocks plugin
We have seen some feedback on subject of editing HTML5 contents inside TinyMCE so we decided to add support for editing the block level HTML5 elements like section and article etc.

We needed to create a visualblocks plugin in order to edit these new block types since it would be difficult without having visible guidelines where the blocks start/end.

Here is a demo of the visualblocks plugin and a config setup for editing HTML5.
http://www.tinymce.com/tryit/html5_formats.php

Styles preview
A common request over the years have been to have a preview of the styles in the styles drop down. The common response we had before was that it would be difficult since some CSS properties of these styles might interfere with the UI. We solved this by only taking CSS properties that alter text appearance and not the once that might break layout.

Feedback/Bug reports
We love to get feedback on these new features or bug reports if you find any issues.