I was curious to see how the Trade-In is working, so when I clicked on the link on the new PWSE page, it brought up the list of eligible devices that are registered to my Kindle/Amazon account. Curiously enough, the current Oasis 3, which I own and is registered to me, is NOT eligible for the trade-in, but the last generation of the PW (which I also own/registered to me) is eligible...
I also noticed something new WRT returns; at least, I don't recall seeing this restriction before when new Kindles are released. Under the "Pre-Order Now" button, there's a link to the Return Policy, which states "This item is non-returnable, but if the item arrives damaged or defective, you may request a refund or replacement." Is this new??? Seems like in the past you could always return it for any reason within 2-4 weeks of delivery.