I certainly agree on the worth of the PPS, Storm. It's a fine concealed carry pistol, indeed: dependable, accurate, and with some punch in the rounds it accepts. And like you, I guess, I'm skeptical about the overall value of the PK380, other than as a potential training gun for the P99, which is silly on the face of it. Why, after all, shoot .380 rounds (if and when you can find them) when you can shoot the real deal (9mm) in a real gun (P99) for a whole lot less money?
I think the PK380 will be a curiosity point for Walther fans: Get one or your collection isn't complete. Beyond that, I doubt that it will see much carry time, unless you want to trade up from your P22 (and if you are carrying a P22, you should trade up to ... something). I also doubt that it will see much range time, either.
Then again, who can say for sure until we get our hands on one and make a determination based on what the gun actually offers and not what we think the gun actually offers?