Had this same issue last year, I called the national Toyota customer service to see what changes were on the new version, they could not tell me, I did buy the new version, my version that came with my 4Runner was 2002, even though the vehicle was a 2003. I was hoping that auto routing and voice guidance would be updated to include back roads, but it was not, still only auto guidance and voice are provided on major roads and in large cities. I did notice that they did make some road additions and POI that were not on the original version, not worth the $230 price, would be nice for Toyota to provide a website like Honda does on the changes of each new DVD version.
Robert