This is the Ford EcoSport - it is based on the current Fiesta platform, it is built in Brazil and sold all over South America. It is a neat little crossover with optional 4x4 - it is VERY cheap - both by price and by interior.
Ford had planned to import these to the US, but that got canned in 2006, by Fields who had deemed them too chap for the US market and deemed they would damage Ford's brand in the B-segment (hence the Fiesta coming in 2010).
Dearborn is not only the Global center of Ford , it is also the Americas (south and north) center of Ford - a lot of South American models get tested there - so the presence of EcoSports does not need to mean much.
That said, the EcoSport is due for replacement about a year after the North and SOuth American Fiestas get rolled out - so they might be starting testing. They might also be in Dearborn for PowerTrain testing - Ford has several small poweretrains in plan for the Fiesta platform - including 1.6l Turbo, 1,0l three cylinder Turbo, and six-speed dual-clutch transmission.
Igor