Or I got thinking about it and in the first movie we saw that the Decepticons had holograms so unless the Autobots like standing out by being cars that drive themselves then the Autobots must also have holograms. To get around the problem of looking like Knight Rider IDW had the holograms do the talking while the robots were in car mode. Thus a way to deliver more lines and get in more of the movie without having to pay for CGI just to say something. The holograms could even be cast to reflect something about the robots personality. A while back someone suggested that Peter Cullen could be Prime's hologram as a fan nod and then he could just deliver his lines in a truck rather than a sound stage. Ha ha, might could even do something weird like Bumblebee using a hologram that looks like Sam.