Considering that I've never, in real life, seen a space gray phone look like the one in that shot, I would say lighting , and whatever other magic was happening while taking these photographs, does indeed okay a role.http://mashable.com/2015/09/22/iphone-6s-review-apple/
http://mashable.com/2015/09/22/apple-iphone-6s-plus-review/
There's a few more close up clear pics of the rose gold in the above link.
Some of them came out salmon/peachy pink but there's a few that's got a more coppery tone to it.
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The colour must be affected by lighting a lot.