Apple's watch now has a W2 chip that does Wifi and Bluetooth, and maybe even LTE (which is how they crammed it into such a tiny device).

Slowly but surely, they've put together all they'd need for a computer. Their T2 chips in the current iMac Pro handle encryption and NVME storage on the SSD's, as well as the camera image processing, Secure Enclave, and the SMC.