What will be the roadmap for RDBMS support? Will it be similar to Zope2.x?
RDBMS systems are already fully supported and are very similar to the RDB support in Zope 2. For connection objects however you now have a standardized connection URI, so you do not need to remember how to connect with every different database adapter. The following database adapters have been implemented already: MySQLdbDA?, psycopgda (PostGreSQL?), pypgsqlda (PostGreSQL?), db2DA, informixDA, odbcDA, oracleDA, sapdbDA, sqliteDA, and sybaseDA. To write your own database adapter, see the NewREDBAdapter? recipe.