The more I look at it - S&W product/handling video and takedown video, the more interesting it seems to me. It looks smaller than I expected. I can see some folks might be tired of all polymer all the time, all metal frames have an appeal. Also - they seem to be including the reported fastest growing gun purchaser segment - women - with this from the spec sheet: "Interchangeable, textured backstraps including small and extra small sizes for better concealability".
Things I wonder - does it have a FP block, and having the safety-blade trigger kind of suggests some people might be expected to carry it condition 0. The weight and thickness of the backstrap would tend to reduce felt recoil...