The plan is you can stick to what you answered in the survey, but it's not, let's say, realisticly feasible with the number of people still in the queue. So ED is asking for those that can do so to do to pay a final, realistic upgrade fee which is a Pandora at production cost (i.e. very little if any extra cash stays in ED's pocket and that goes to pay for your Pandora) and only when the units are in stock again so not cause another preorder shitstorm. Trust in the Dragon he want to help!
Others have kindly written off their loss and let ED off the hook with thier order, essentially this is a donation of what they originally paid.
Others have donated to try and ease us forward, but there is still a long way to go.
So do what you can so - if you can do something that makes the queue advance then it's appreciated, but if not it may take a while to work through the remainder of the queue.