You can download Plone1.0-alpha 2 from "Sourceforge":http://prdownloads.sourceforge.net/plone/CMFPlone1.0alpha2.tar.gz?download
You can download CMF 1.3 from "cmf.zope.org":http://cmf.zope.org/download/CMF-1.3
Two of the numerous new features:
* Private Plone site Customization Policy - when you 'Add Plone Site' in ZMI you can select this new policy which will customize your Plone so that anonymous users only get a login box. People kept getting confused (rightfully so) about how to setup security in CMF via Workflows. This does it for you.
* WYSIWYG editor integration - currently the Document edit form has been modified to expose the XSDHTMLEditor (IE5.5+) when you click on the calendar widget next to the body textarea. In the next release (beta) the WYSIWYG editor will be set in your preferences.
Tons of bugs and usability issues have been addressed. Please test this out and report any issues to the "bug/feature collector":http://plone.org/collector
Plone is and was proclaimed feature complete. We are pushing the WYSIWYG stuff into 1.0 release because Plone needs this functionality to be competetive. The security policy isn't much of a feature.
**The Plone Team**