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For now, see http://sourceforge.net/apps/mediawiki/ecm/index.php?title=Main_Page The content from that page will be moved here, and updated.
Enhanced Content Models add several new features to the CMA of Fedora.
1. Ability to specify an ontology for the object relations
2. Ability to specify ontologies for the datastream relations
3. Ability to specify schemas for the datastreams
4. Ability to specify optional datastreams
The ability to clone an object will probably be added to Fedora, but it is not a direct part of ECM.
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A validate method that will validate a data object against the constrains specified in it's content models.
This is in fact covered by the JIRA issue http://fedora-commons.org/jira/browse/FCREPO-685