They used to make that kind of "dummies" for that rumoured "teardrop"-shaped iPhone 5, too. Case manufacturers do not always wait for Apple to reveal privileged information to them before starting designing. They just happen to follow the same (often unreliable) rumors as us.
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So take this with a grain of salt...
Just a small clarification; this was the potential iPhone 4S (the fifth iPhone). We had a bunch of legit leaks for the iPhone 5, IIRC.