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I'm sure the phone is already prototyped out and in testing (it takes months to do proper prototyping and testing), but leaking like this is very unlikely. They may be starting to work with their Chinese suppliers on tooling and manufacturing logistics for the machinery, but enough for a random guy to get a hold of a chassis? Not impossible, but very unlikely.

Heck, the iPhone 8 design two years out is almost certainly forming in a ton of Jony Ive's sketchbooks. These things take time, even if you are Apple.
 
It looks like the Huawei P9 that is rumored to come out, but I wouldn't 100% discredit these. iPhones have leaked this early before, and I wouldn't be surprised to see it happen again.
 
The same factory that builds iPhones apparently also has a Huawei contract. Pretty certain this is a Huawei, someone even posted a leaked case for the P9 that lines up with these ports.
 
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