I would sure go for the K-S2 if I have to buy now.
It has too many advantages like flip screen, wifi (even if it might be slow), small size, less weight.
Below are the features of KS-2 that are very attractive to me - taken below straight from the review:
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"Another novelty introduced with the K-S2 is "Clarity Enhancement" — a RICOH-developed imaging technology designed to capture the subject’s texture and unevenness more truthfully and produce a more true-to-life depiction of the subject. There is also a new mode on the mode dial: A-HDR (Advanced HDR), which combines the Clarity Enhancement with the conventional HDR mode for capturing extra-wide-gradation images.
The K-S2 has no AA filter in front of the sensor, and it has the same AA sensor-share based filter simulator as the K-3. The filter simulator can be turned on if moiré is an issue in a given scene (textiles, feathers, and the like with repeating patterns).