Not that it means anything since you STILL can't co-exist with Exchange 2003, 2007 or 2010. But at least you can test your storage out for whenever it becomes possible.
This version of JetStress is supposed to simulate Exchange 2013 storage disk IO. I hope it does and they didn't just do a search & replace for 2010 to 2013. If they did do that then they screwed up…
Download Jetstress here: https://www.microsoft.com/en-us/download/details.aspx?id=36849
See why I made my last comment here: