It may very well still be Quick Charge 4.0, but only be equipped with a 2.0 charger in the box. It's those accessories they want you to buy, just like the AKG Bluetooth headphones, the standard wireless charger, and the quick wireless charger...
My iPad mini came with an 5W iPhone AC adapter, though I know it can handle 10-12W for even speedier charging. Apple was just being cheap about it.