Yeah, but this is their existing CPU/GPU designed to fit into the constraints of the iPad form factor. They'll likely have something much more powerful for consumer hardware.
The iPad CPU/GPU is already thermal limited. An unlimited A12Z is right at the TDP of a laptop chip, at ~25-30W (5W per big core per anandtech, 4 cores, plus GPU and I/O, it's actually quite a generous estimate.
An unlocked A12Z is likely all you can get away with in a laptop, and inferior to SOTA x86 low power CPUs.
