Well, the main reason I want to know is because I want to convert some movies for storage and viewing in the truck. Knowing the actual pixel dimensions of the screen means I can conserve some hard drive space by converting my videos to that same size instead of leaving them as is. Same concept as converting a movie to fit a handheld screen. There's no benefit in picture quality watching a 1080p movie on a screen that is only 800x480 pixels, but there is quite a difference in processing power and storage space needed for that 1080p movie.
As I said, neither the dealer or anyone at Chrysler could answer my question. I e-mailed someone at the website you linked and got no answer.
As for a radio update, the dealer checked it on Monday and said it was up to date. Why would you think otherwise?