I just email our DSM to see if he could share anything. I hadn't even thought about trying to upgrade a 3406 with a 3406. Most of my clients purcahse these outright but I couldn't imagine going in and telling them here is your new Savin 3406 and its the same as your current 3406 except you get a software piece that you don't really need....
I would offer to extend his lease for another year or two until a new machine comes out. It's a great way to reduce their monthly expense while making some good profit & commission for yourself.