I think it's literally an 06 Explorer with a pick-up bed. It makes a lot of sense but it surprises me a bit. I was expecting the new Sport Trac to have an exclusive grill and fender flares much like the original ST (and Explorer Sport) varied from the primary Explorer. I haven't seen the interior but I'd be surprised if Ford decided to use the 06 Explorer interior and not the previous ones. Just an observation. I really like how the 07 Sport Trac turned out though, particularly the "deck spoiler" look on the bed, which I thought would never make it from the concepts. I can only imagine how much better the 07 interior is compared to ours.