News came lately that Autodesk is in the process of acquirering Green Building Studio.
Green Building Studio Inc. developed the Green Building XML (gbXML) schema and launched the Green Building Studio web service in 2004. The web service offers whole building energy, carbon, and other analysis tools for architects.
Hopefully this aquisition will better implement energy modelling into Autocad Architecture and Revit and still keep GBS open for other applications.
Green Building Studio: Press Release