When I posted, it was being reported on a variety of sites, linking back to IGN France. IGN France has since published a retraction (in French, which I can speak, so sorry for no translation).
So the reality is, we have no clue what comes after the two launch “kits”. And it seems that based on the fact that there are two kits with unique software, that there is a certain amount of specific code. Which means… well, I have no clue. It may be that things end up being cheap and expandable off of the variety pack, or it may be that each new set “kit” contains unique software, and thus commands a premium price. I guess we will have to wait and see!