I've checked with Autodesk. Revit MEP is not a vertical platform based on AutoCAD. BUT: AutoCAD Revit MEP is a part of the Autodesk Revit MEP Suite, so I get two programs for the price of...well... approx two
Some ground for confusion. AutoCAD Revit MEP and Autodesk Revit MEP. That is actually two different programs. AutoCAD Revit MEP is a vertical program running on AutoCAD. Autodesk Revit MEP is made with similar functionallity but differs a lot in the programs architecture from AutoCAD. Or so they said