Click this link and order you a Bully dog programmer!
http://www.speedlogixstore.com/product_p/40430.htm
I talked to the guys at Speedlogix today and they confirmed that it will work on the 2012 2500 Hemi with the new 6 speed. They said it doesn't matter what transmission is behind it, as long as it's a Hemi. I already have mine per-ordered!