A new bracket secures the (bitty!) Taptic Engine and its new cable.

The Taptic Engine in the 6s Plus measures 15 x 8 x 4.9 mm compared to the 35 x 6 x 3.2 mm one found in the 6s.

Our guess as to the reason for the substantially smaller footprint: Apple didn't want to shave off too much from the already-scaled-down battery.

No question about it—it's a tight fit with everything assembled.

The Taptic Engine also has a lil' rubber bumper for bracing against the microphone.