Last night we went out and came across some US Ford Fiestas in the wild. I happened to have my Flip with me, but since we were running late I just grabbed a few seconds of video.
Now, from what I was able to gather, this was Roush doing the test drives. I tried looking closely at the video, but I can't determine if there is anything special under the front grill. It does sound different from our European Fiesta.