Just an FYI but I received this bulletin from Tekonsha this morning. I picked up my 13' Ram yesterday and I had a P3 Controller in my 08'. Also I have spoken to my dealer and the kit for the 2013 will not be shipped until March 4th.
From Tekonsha:
The electrical system on the 2013 Ram trucks has changed. Though the brake control connector is the same as the 2010-2012, the wire functions have changed. The terminal that used to be the stop light signal, now has battery voltage, whenever the ignition is in the run position. According to Dodge, it is not possible to install an aftermarket electric trailer brake control into these trucks. Dodge says, that “the 2013 Ram has “Powernet” and utilizes multiplex wiring that is different from any previous design’s, therefore, your aftermarket trailer brake control is not compatible”
At this time, the only aftermarket brake control that can be used on a 2013 Ram truck, is the Tekonsha 90250 Prodigy RF. As soon as more information is available, a revision to this technical bulletin will be sent out.
Any attempt to install an aftermarket brake control into the vehicle, may cause severe damage to the vehicle’s electrical system or electrical component!
I had to copy and paste because it was a PDF.