The first thing (Nobuo) Nagai-san10, who's in charge at the Uji plant, said to me when he looked over the designs for Nintendo 3DS before mass production began was "This time it's fully packed right from the start."Of course it's doubtful that Nintendo would actually say anything about a system redesign coming down the line before the original unit even launches but... maybe a little piece of mind if you're on the fence?
Iwata Asks is right here, if you'd like to read the entire interview.