from what i've read its for an Arm M0 / M0+ core chipset. Ultra low power. Not very big but capable of operation off micro amps. Think still operational while your device sleeps or you think its off. Also useful for INTERNET of thing devices requiring small size low power. This thing is tiny but a lot could be done with it. enough memory and capability to control a lot of things
Jeep was hacked by wifi. Car can bus can be hacked via OBD. Most cars have very low security. times are changing and security and private keys are being added. If you can get control or jam the can bus via a data port you can spam the can bus causing too much data
or overloading a device with EMC and cause it to fail. Also bluetooth is a path as well.