Hi All!!
On the demo page I have an issue with iframes but only on "full featured".
Try inserting this code:
<div class="media_embed"><iframe allowfullscreen="" frameborder="0" height="315" src="http://www.youtube.com/embed/ivSnkLWXLIo" width="420"></iframe></div>
in both 'full featured options' and on 'standard editor' and see the diferences.
On full featured I see a box with 'iframe' text in red, but on standard I you can see the preview of the video.
Somebody know why this happens? is an option? Is a bug?
Sorry about my english
Regards Juan Pablo from Argentina

The difference stems from the
The difference stems from the fact that the Full preset contains the IFrame plugin that is responsible for creating iframes and that inserts a placeholder for the iframe when in WYSIWYG view.
The Standard preset does not contain this plugin, so no placeholder (fake element) is being inserted and, in a way, iframes cannot be supported through the editor.
It's not really an option, but more of a consequence of editor configuration. You should not rely on this behavior, thogh, as it is bound to change when CKEditor 4.1 is released and it will be possible to define allowed elements through a configuration option. Elements that will not be allowed (either through a plugin or by whitelisting) will simply be removed by the editor.
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thanks
Thanks Anna,
I just added
to my config.js and now I can see the preview while editing.