Is this the same Parrot that announced a nice little adaptor and ampliphier that allowed connection between an airport express and a pair of unpowered stereo speakers? I don't recall that ever shipping.
I do have to admit I like the idea of obd2 connectivity, would be great if they could leverage this to allow an approaching iphone to unlock the owner's car via bluetooth.
Anything that talks to the car via OBD2 is restricted to what OBD2 can do, namely clear engine codes and read engine / emissions data.
OBD2 isn't some magic control bus for every system on a car. There are cars out there that have a common data bus for many systems, but it's neither standardized, nor OBD2.