The 5C does. Actually, they are returning to the 3G/3GS days, before changing to the metal case for the 4/4S.
The 5S are brushed metallic finishes: gold, silver, and graphite.
But, there's only a $100 difference between the 5C and the 5S, and you give up a lot of features and performance.
THe Wife and I are getting a couple of 5S models.
$200 difference, if you're looking at the same storage capacity.
The 5C is simply an iPhone 5 in a different case, with the extra dimension required for the plastic vs. the metal casing used to slightly increase the battery size. I don't see what everyone would be expecting otherwise - this is simply going to take the place of the original iPhone 5 (which is now discontinued) as the entry-level phone for people who, frankly, are bad at math, forgetting how much of their monthly bill is going to pay for that "cheap" phone. (This isn't Apple-specific, of course, it's how the cell companies do business - a "cheap" phone that costs several hundreds more over two years...)