You mean something like SolidWorks?
I've also heard the rumor, but I'm also of the opinion that it's a rumor. What might happen is that Revit / AutoCAD might converge - bringing the best from both into one package: I.e. the general BIM drawing though a Revit like interface - while allowing AutoCAD like commands for that linework.
But hang on ... isn't something like ACA (or other) exactly that, just from the AutoCAD base instead of the Revit base?