A recent issue of
Consumer Reports had an article on the electronic vehicle to vehicle wireless communication systems under development. These are going to do things such as warn you about a vehicle ahead of you around a blind turn, etc. They also mentioned bicycles, although the article did not mention any testing of wireless equipped bicycles at present.
As a bicyclist, I have mixed opinions on this. If motor vehicles are routinely equipped or retrofitted with these, drivers will increasingly rely on them and tend to be less vigilant about other vehicles like bikes. On the other hand, if bikes routinely had these, it could improve safety. However, given the number of cyclists at night who do not even use lights, I am not optimistic about bicyclists routinely carrying such an electronic devices.
Some details about this
on DOT's site.