Steve-
<a href="http://news.windingroad.com/body-stylesmarket-segment/sport-utility-vehicles/spotted-2008-ford-explorer-sport-trac/" target="top">Here ya go.</a>
I've got a feeling it's just an appearance package more then anything else, or even a refresh for '08 Job 2. If there were to be a different engine/drivetrain package, then there'd be test mules out on the road to show for it. Of course, one <i>could</i> put a new motor in a regular, non-camo ST for testing and no one would be non the wiser, as it's the camouflage that sets the spy-photogs off.