Understandable about the 3GS and 4S, but the 5S is for security? Why? So the 5C wasn't? Aren't they both running the same OS?
the 's' does actually indicate something and it should be pretty easy to figure out..
but people need it to be more meaningful than it really is so they make up things.
go on a canon forum and ask 'what does the s stand for in 1Ds?" ..someone will surely answer 'studio' (even though the 1D is also a studio camera)
go on a nikon forum and ask 'what does the s stand for in D2Hs?" ..someone will surely answers 'sport' (even though the D2H is also a sports photography camera.. and i suppose just ignore the s in D70s or D200s since those are no more sports geared than their D70 / D200 predecessors.. but i imagine if you ask about the 's' in those names, someone will likely give you some made up answer as well)..
if the 's' meant something special for each v2 iphone, don't you think the apple marketing team would be all over it? or, at least somewhat over it?
i'd be willing to bet the only reason t.cook said 's is for siri' re: the 4s is to dissuade people from sitting around going.. "oh :bright_idea: ..it means iphone 4 steve" since it was the phone released after his death.
what does s mean? it's the second iteration of a particular model.. but that's boring so what does it really mean? whatever you want it to mean or whoever's meaning you want to believe.