This is the First Public Working Draft of EMMA 2.0 and there are several new major features, including the support for system output mentioned above. This Working Draft also describes how incremental results can be supported, in addition to several other new features. The official announcement is here http://www.w3.org/blog/news/archives/4965
Please send any comments or questions about the new Working Draft to this list, particularly any questions about the new features. Since this is the first publication, there is a lot of opportunity for the new version of EMMA to evolve in the directions that best support industrial and research use cases.