Are those pics rectified? At the same scale?
Regarding the splitter, Im not saying they're fake because if they're using GT500 front on this s550 prototypes they aren't. Unless Ford is making a 2014.5 version of the current s197's I really doubt that exact splitter is going to be in the 6th Gen.
The slope in those images can't be compared because of the angle of the picture. The s550 was taken stand up while in the s197 -probably- the guy was kneeling giving the green house a less aggressive slope than it really is.
Regarding the front splitter, why Ford would put a splitter...
This is my stake on what's happening w/ this mules...
I think they're using some s197 parts to hide even more the real shape of the s550 Mustang. As you can see here, they kind still using the current GT500 front -posibly 2010 parts- as its evident in the round lower foglights, splitter and...