I would also go as far as to say that thinking ahead and assuming that any future SNS implementations will be called “SNS-nn” is wrong. Each SNS will be it’s own DAO and dfinity just decided to call their initial live test SNS “SNS-1”… they could just have easily given it any name.
Then they had the idea of dropping some governance tokens for this SNS only to selected members from each of the three projects that were mentioned. That’s the only link. There’s no other link between this SNS-1 test SNS and any other SNS implementation that may come in the future other than that they can probably learn from the way this one turns out!
I’m sure dfinity will tell us in time what we can then do with the airdropped tokens on SNS-1…