It is exactly the same on the S7E. The black one has blue'ish tint. The gold and silver ones have a slight yellow colour. Something to do with the foil used under the glass. Doesn't bother me at all (gold).
I actually noticed in one of the many youtube launch 'Hands on' vids i watched, that one had orangish coloured backlights. But only have seen it ones.....wonder if this could be the first issue? Hope not
My point exactly. I will bet that it was designed that was so that there is some contrast between the case color and the button lights. A design choice to make it easier to use and see, and people jump to "button light-gate"
Oh, and there will be an issue, or 2. Hope doesn't come into play. Its a complex device that it trying to do a lot. Every device, every....every....every device has an issue. We will be lucky if a slightly off color white button light is the issue.
You may now proceed with the "I was going to get a Note 7, but this light color thing is a deal breaker" posts.