I suspect that there'd be a fair trickle of previously-shipped Perfs on the used Model S market later this Fall thanks to this package.
A fair number of the early Perf buyers surely have the means to sell their S to get a new one with this package.
Incredibly smart on Tesla's part to stagger the release of this package till a few months into US/Canada production! Recall that Elon's Founder #2 Model S has had some iteration of this package since as far back as last June
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
(it was mentioned in many of the early media reviews when they were loaned Elon's car)
Suckers!