After a bit of research it looks like there will not be a plug-in for navis in revit 2013, but revit does have a better clash detection built-in and that navis 2013 will open revit files.

But my question is I would like to continue to use navis manage 2012, is there a way to export revit 2013 to navis manage 2012?
Also is the switchback function still available between revit and navis? If so where is it located? I didn't see much on the subscription center.

Thanks for your help.