Chipworks did some investigatin' and found the M7 to be an NXP LPC18A1, part of the LPC1800 series of high-performing ARM Cortex-M3 based microcontrollers.
Don't believe them? Check out the NXP inscription in the top right of the die photo.
This isn't the first time we've seen a Cortex-M3 used for motion tracking. The folks who made the Oculus Rift used it for the same purpose.
From Chipworks: "The M7 is a new direction for Apple: in an effort to reduce power consumption, the M7 chip is dedicated to collecting and processing accelerometer, gyroscope and compass data."
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