This is not the digital download version box, is it? Is there even such a SKU planned/announced? Retailers all only list a single SKU for the standard and legend editions:
http://www.gamestop.com/nintendo-switch/games/nba-2k18-early-tip-off-edition/148342
http://www.gamestop.com/nintendo-switch/games/nba-2k18-legend-edition/148347
October 17 is the release of the retail edition.
Yeah i think we've been operating on the assumption it's for the digital version releasing day and date with the others, but that seemingly is an incorrect assumption.
However, the "early tip off" edition makes no sense with its "4 day early" stuff from 15th September if its not releasing until October, which is why many think there are issues with the listing and that this is for a digital code in a box launching in September, unless that's no longer coming to the switch version.