From reading the last couple of pages, I just wanted to again pass along my experience with Amazon USA so others who might not have seen it might benefit.

In talking with customer service about the $50 rebate, I was told that canceling one's pre-order and re-ordering will, in fact, move them to the back of the line. Although the new order still *might* ship at the same time as earlier ones, this will depend on how many pre-orders are placed and what type of shipping you select (eg overnight shipping actually leaves the warehouse earlier than super savers, regardless of pre-order date)

Also, the customer service rep I spoke with manually changed the price in my account to reflect an immediate $50 rebate...no need to re-order or mail it in after purchase.

Although there have been conflicting reports on these details (see spinnukur's posts for a different take), I wanted to post again so others might not miss out. Also, more calls to customer service might put a little pressure on Amazon managers to hustle up a bit...