This is definitely in the works. The biggest problem is convincing the countless local authorities to upgrade their existing traffic systems to support a technology that's not in the market yet.
Right now all the telematics stuff is broken in to pieces you could do a lot of neat stuff if they were better integrated. You could use that preemptive braking stuff to decide I am in traffic on an interstate an find a new route.(Hint if the speed limit is sixty and I am with in a few feet of the guy in front of me and my current speed is below 5mph I am in traffic and the gps system should reroute me.)