Well I definitely don't think they are releasing it at a static price. I don't know what that means, but they were very clear about their opinion on the "$300 hardware/$60 software" model. They think it's antiquated. They brought this point up in the same paragraph that they first hinted at My Nintendo as a solution to the software part, and they specifically mentioned hardware too.
I don't know what they plan to do, but don't be suprised when they do something. I'd be very suprised if they launched NX at $400 with no catch, even if I personally would be very fine paying that. They've expressed, on numerous occasion, an objection to anything over $300, and even implied that that was more than they wanted. Subsidation was just my guess since Apple does it and it works for them.
Remember the patent for the Supplemental Computing Device? If I remember correctly, it stated the potential to license out your SCD to others and get reimbursed. If any NX device can act as an SCD than that could their way of shaking up hardware pricing.
It would sorta be the hardware version of My Nintendo since games are still the same price, you just accumulate points by purchasing games.
Refresh my memory - what is an SCD?