Honestly, what would be the point of a press invite NDA? We know there's an NX and we know when it's scheduled for release. Would a reveal date, leaked a few weeks before, affect their current sales that much? Are NOA banking on a few weeks of Nintendo Select sales and the new 3DS Mario sku to the degree that an unveil date would be detrimental?
Yeah I don't get that either, which is why I initially assumed there would likely be no NDA, but ggx probably knows better than me:
Press invites have always come with NDAs, that's why some guys said that they're going somewhere but can't mention what for. Problem is we can't probably dig up if this happened in the other 13th of September events in the previous years.