OH48Lt - You are correct, it is actually called the HD Payload Package. Now includes 3.73 electronic locking diff, 9.75" gear set, upgraded springs, aux trans oil cooler, 18" aluminum wheels.
The HD Towing package includes Class IV trailer hitch receiver (with the new frame design, there is an integrated drop down for the hitch), upgraded front stabilizer, upgraded rear bumper, integrated trailer brake controller, 4 & 7 pin trailer harness, Smart Trailer Tow Connector (provides feedback on trailer lighting, brakes, even battery condition).
The mirrors are a separate option this time around. I don't care if I have turn signals and spotlights in the mirrors. I do like the other options - heat, puddle lamps, and the convex mirror combo are nice. I consider upgrading the mirrors on my current truck every Spring, when camping begins, and I need to fumble with the CIPA mirrors.
Between A-Plan and other incentives, I saved $9,800!