What these spy shots tell us straight away is that the new, fourth-generation Ford Focus will have a larger footprint than the outgoing model; evidence of tacked-on sheet metal stretching both the length and width dimensions is present. As Autoblog points out, a seam can clearly be seen running down either side of the car to each rear-wheel arch, and another seam is present at both the front and rear ends of the test mule.
This shows without a doubt that extra material has been tacked-on to cover an extended track and wheelbase.
Beyond that, there isn’t any additional information to be deduced. A replacement for the current, third-generation Ford Focus isn’t expected to bow until late 2017/early 2018. It’s uncertain whether the normally-aspirated, 2.0-liter Flex Fuel I4 will continue to be the standard engine, or whether it mightn’t be replaced by a turbocharged EcoBoost unit.