When apple releases their 3g iPhone, very soon, will they offer a plan to trade in a used iPhone. I own a iPhone and really want the updated version. Will I be able to trade in my current iPhone for a new one? Will apple ever offer such a deal? If they do will they be at a loss for the trade in? Even if they do will it be just for customers of the last 30 or 60 days?

No they will do no such deal sorry