Ahab,
I, for one, hope that that Walther does well, and spurs others-maybe even Glock-to follow suit. I believe that, while there is only marginal demand among existing shooters, a standard/compact (not sub-compact) in .380 would be a boon for newcomers. It would be a great way to get a more effective pistol into the hands of those who cannot handle the DA trigger on a revolver, or the recoil of 9mm or up in an auto.
It looks also like it might be a great gun with which to introduce beginners to centerfire pistols. More expensive than a 9mm, to be sure, but the drop in recoil would be a valuable asset. My one curiosity is this: since they went big, wouldn't a locked-breech design have made more sense?* Then they could have put a lighter recoil spring in it, which would be helpful to those who are attracted to it because of hand strength concerns.
The traditional (difficult) choice for those folks seems to be a revolver, whose cylinder can be easily manipulated, but who's trigger can be difficult to pull, or an auto who's trigger they can pull, but who's slide is difficult to rack. Maybe a scaled-down P99 would have been a better way to go than a scaled-up P22?
Those in-the-know will always choose the most powerful cartridge/platform pairing they can handle. For some, a substantial .380 may be it. Like most on this forum, I can and do use more powerful guns. However, I like to see designs that create an opportunity to convert more people into shooters; for their own good and ours.
*BTW, the Kel Tec is actually a locked-breech design, as is the very similar Ruger LCP.