"Actually, they definitely were thinking "selfies" although I don't think their marketing stuff uses that term."
I'll stand corrected on my comment that they weren't thinking selfies, given the info about the w-fi button conversion to shutter button, which I didn't know about. But my main point -- which perhaps I did not make well enough -- had been that I do not think that the K-S2 was rush-developed after observing possibly low K-S1 sales, and making the K-S2 selfie-capable for that reason alone. I think the K-S2 was in design as an articulating screen replacement for the K-50 even as K-S1 was just being marketed. I would have to hear Pentax say that K-S2 was a K-S1 rescue mission before I thought otherwise.
That the w-fi button converts to shutter button, I am actually jubilant about, because it is exactly the kind of out-of-the-box, quirky-yet-useful idea that Pentax is so good at. It's a very cool touch. And perhaps it's in the nick of time, too. Today (2-15-15), The New York Times has a page-one story on selfie sticks being BANNED from museums. And I quote: "One by one, museums across the United States have been imposing bans on using selfie sticks for photographs inside galleries (adding them to existing rules on umbrellas, backpacks, tripods and monopods), yet another example of how controlling overcrowding has become part of the museum mission." This is only going to spread to other kinds of locations as people continue to knock things over, poke strangers in the head, etc. with their selfie sticks. The K-S2 wi-fi button swap to shutter button is a very timely development. Good for them yet again.