The Fiestas seen here share slightly different front fascias, with one featuring large opening in the side. Though it's difficult to tell, these could be air inlets or places for optional fog lights. The cars also ditch some of the rear camouflage seen on previous testers, though the wrap makes details difficult to distinguish.
Don't expect the new Fiesta to change much in size, though the new model should feature heavy updates to the interior and available tech. Shoppers are demanding more premium options from smaller vehicles, so expect premium optional features like parking sensors and blind-spot monitoring to be available. Look for the 2018 Ford Fiesta to go on sale sometime next year.