At the time of this writing, there is only a catalan version of the development documentation. You can find it in the docs/*.rst documents or at this site:
http://genweb.readthedocs.org/en/latest/This is the next-gen agnostic version core Genweb UPC add-on product.
It defines all the base modifications to Plone by UPCnet. This modifications includes: - Custom translations to Catalan, Spanish and English - Default parameterization of sites
- genweb.theme
- genweb.portlets
- genweb.controlpanel