I'll voice my opinon as well, because the more Ford sees that they didn't get the '07 right from the mouths of consumers, the more likely they'll be to fix the problems.
As with others, the chrome grille needs to go. Make it satin aluminum like what the Mariner has. Remove the cross bars while you're at it, the diamond pattern of the concept was fine.
Taillamps...eck. At least darken or "smoke" them, at least make them look different then the F150's.
Add a motif. Although I think it's too late for that now, but from the pics, I see no recurring pattern. That was one of the neat little things with the current ST, the repeating hexagons. The front grille, step bar pad, rear step pad, the rubber flooring, even the speaker grilles and grip on the steering wheel all had these little hexagons. It wasn't overdone and added a sense of flow and togetherness to the vehicle.
Mainly, this vehicle isn't unique enough. See the current ST from the front, you know what it is (although the occassional mistake for a Sport is easy), see it from the side, you know what it is, see it from the rear, once again, you know what it is. The 07 is an Explorer from the front, and F150 from the rear. Only in profile is it unique. Sure a V8 is nice and we've been critical about the lack of a V8, or power, around here, but we've always have liked how different and unique we were. Driving the '07, we're just a confused buyer who can't settle between an Explorer or an F150, and that's not what we want.