I stumbled upon your post, the right place at the right moment! I'm about to evaluate the BPMN tool (http://tinycc.me/sLxBi7) Cameo Modeler and I wonder if BPMN processes designed with Visio 2013 can be imported into Cameo. Model interchange between tool is a key point to make a decision, as well as the adherence to BPMN2 standard.
Thanks