I doubt Amazon would be stupid enough to leave this possibility unaccounted for. Even the most basic purchase on Amazon requires you to put in a password to confirm your purchase. Why would this be any different?
Or are you simply being a model HN contributor and nitpicking any little thing that comes to mind?
Amazon has had one click purchase for years on the web: http://en.wikipedia.org/wiki/1-Click. The whole point is to not require re entering a password each time. In fact they hold the patent for it and have sued others for it.
You have attacked me for misinformation whereas you are the one misinformed.
EDIT: I am a Amazon Prime user and turned off one click because I saw my son clicking on stuff he wanted. And there is confirmation email. You basically have to rollback the purchase if you can. Sometimes you can't if it's shipped.
No, the Kindle Fire on release didn't lock out random purchases - in fact no password required for any app purchase. So there is precedent from Amazon, though they've probably learned.
Where do you see a keypad for this device? How will you enter a password?
Or are you simply being a model HN contributor and nitpicking any little thing that comes to mind?