In reference to the test in the other thread with the Golf R, I think those guys missed the boat on the torque vectoring and DCCD.
They turned everything off and then dialed the DCCD to the rear cause they thought the car was understeering. To make the 2015 drive exactly like the 2014, that's what you do. It's an exciting way to drive - with the back end loose - but not the fastest.
You drive the 2015 differently. The 2014 didn't have the precision and front axle grip that the new car has. The way through a bend in the previous car was to go in, add too much steering, get the car to pitch ("back it in") and then when the front is pointing at the exit of the corner, straighten the wheel and punch it. The 2015 CAN be driven like that, but it's not the fastest way through the bend. Now you can trail brake a bit to set the outside front, apply power smoothly and as the front end hunts, the torque vectoring becomes your friend. After you clip the apex, keep your foot in it and the vectoring and AWD together will find every last bit of grip. You're not coming out with the tail hanging out, but you're coming out with a LOT more exit speed.
I took a ramp marked for 40 - that I am right at the limit in the Miata at 100 - at 120 in the STi and it was PLANTED. Jumping from a 2014 to the 2015, the car might feel a little boring cause you're not having to see-saw the wheel through every tight corner.
The friend that owns the 2015 I drove moved from a previous gen STi and he gushes about the difference in chassis capability. He's also one of the best amateur drivers I know - he's really, really fast. No matter which car he brings to the Auto-X, he's posting the lowest times. (including in his bone-stock 116hp 1990 Miata)