[citation][nom]prrrowr[/nom]Sounds like the traditional DS game cart no longer stores a full game but the wifi download 'rights' to a game torrent which will then be stuffed into a user's 3DS internal storage. But doesn't that mean you have to wait overnight post-purchase to play your game?[/citation]
That's an interesting interpretation... Though I'd heavily doubt that sort of idea. Given that the cost of ROM is spiraling ever-downward, I wouldn't be surprised if $5 could readily produce a 1-2GB ROM cartridge; after all, that's about the price to manufacture said space in NAND flash.
Rather, the only elegant use of this I could see is, perhaps, auto-downloading of new content/patches, akin to an "automatic update." Given how costly in bandwidth it could be for Nintendo, I don't see them pushing all-new content a lot; perhaps a few experiments (read: market tests) might try that to push a small demo out to all/a lot of users, but I'd be surprised if this was more than a semi-rare occurence. There's little reason NOT to include all the data on the cartridges themselves.