No way is this the last one (btw technically it's a dealer exclusive, not a sprint). They are way too popular for dealers not to be willing to commission more. Plus the original PM was on the market, what, 6-7 years? There's no chance of going that long without another given even the model's popularity.
Or did you mean last for the year? I don't see any more on the exclusives page on Spyderco's site. The blue PM2 is coming back for another run in December, so based on that and past wait times, I suppose it takes 6-12 months minimum after commission for Spyderco to deliver. If the exclusives page is accurately updated, I'd guess we won't see any new runs before the new year, December at the earliest.
That's all a lot of speculation, though.