Is it a capital C and S or lowercase?

Every tech and news website I've been on has been calling the new iPhones "iPhone 5c" and "iPhone 5s", both letters being lowercase. Who said these letters were lowercase? The S in 4S is uppercase.

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via scotche.gg

And from the new logos, one would think the C and S are both uppercase.

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via images.apple.com

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via images.apple.com

So why all of a sudden are news websites giving these iPhone models lowercase letters? Did Apple themselves make them lowercase when they presented them?