I really like the idea of the disappearing blind spot - can I get this installed on my passengers too so they don't block the view? ha! But seriously, that is a really neat trick/application of tech.
I doubt this requires a special windshield - rather it likely projects from somewhere in the dash and simply reflects off the windshield (maybe shaped a bit for optimal viewing). Distracted by too much information/input is a real problem to be concerned with - look into the military development of heads up displays and issues surrounding them. However, these things can be resolved (providing info as needed, limiting to actionable/necessary inputs). Example - instead of a ghost car with "follow me" on it, a simple arrow inserted in the line of view indicating where to turn etc would be more helpful to me... everyone is different of course.
I recall a 'heads up' display on vehicle a number of years ago... don't recall the model. It only gave basic console info (speed/tach type of info). I don't think it caught on (perhaps because of low marginal benefit to this info being in immediate line of sight).