People have to remember that SONY makes alot of the components for the NGP and most likely the whole lot unlike the 3DS that uses Screens from i believe Toshiba.
No one has an single clue that SONY could be selling at an lost. Nor the Manufacturing or the costs of the components of the NGP. I dont and no one here or on the internet other than SONY employees that manage finance.
But my prediction on the Pricing plan would be 3 ways to buy
1st: Would be an 3G data plan with an telco provider, were depending on the plan pay from full price to 0 dollars.
2nd: Would be an no 3G model that you buy from your electronic retailers at the cheapest price avaiable
3rd: Would be an unlocked version of the 3G, and will be the most expensive model but you have freedom.
For me in Australia, an 20 dollar an month several gb contact with Telstra and only having to pay 200 dollars for the device is an neat deal for myself considering Telstra has the worlds fasted wireless 3G network.
Of Course That's Just My Opinion, I Could Be Wrong