I'm not sure if you have gotten your answer on this or not, but the new versions of Revit - 2012 and 2013, have come a long way since it's conception. I will have to be honest about it though, it has not progressed in the MEP fields as it has in the Arch and Struct fields. It is getting there and it has come a long way. I do believe that it will come to the point where it will be able to produce data like an electrical engineer would like, but you have to realize that in these fields it would need to be specific for say any region. You know as well as I that there are specific codes or regional even global considerations to take into account that would take a lot of manipulation of the program to fit everyone's needs, so I believe that it will remain as generic as it possibly can and let the third party programmers set up the add-ons needed for specific parties. I hate to compare it to AutoCAD Electrical given that I don't know or understand the program that well, but Revit has it pros and cons when dealing with Electrical. Hope that helps as it is quite a late response.
