The Unified Content Model Working Group is a Production Working Group. UCM is powerful new tool that is proposed for inclusion in the Platform. What use will the CMS make of it, what are the backward compatibility issues involved, what new coding would be needed to use it in the CMS, and what are the implications for third party extensions are all open questions.
The original code from eBay
The first extended discussion on the platform mailing list.
Rob Schley talk at Joomla Day New York
Elin Waring slides for PWG lightning talks at Joomla and Beyond 2012
Video of PWG Meeting at JAB 2012
Video of session on UCM at Joomla World Conference
Slides from Elin's session on UCM at JWC
Sam's example of a web services application
Stefan's GSOC application using UCM
Long term, a new Joomla application for the management of content.
Initial infrastructure for use of a single core table: 3.1. Migration to a single core content table for all core components for 3.2