This is an iFixit teardown from August 2013. Looks like the Motorola Moto X is sporting an MSP430F5259 controller( 128Kb Flash and 32Kb RAM ). We are not sure what it controls, but we are interested to know.
This is wayback from April of last year. Peter Kim from the Hardwhack blog explains he needed to program two of his newly soldered Bus Pirate PCBs.