Evolving Skies Pre-Orders are being released periodically, this is so all of our stock isn't sold out in one day, and we can keep releasing stock every so often towards the release.
If the products are showing as out of stock, do not panic. They will be going back in stock. We recommend signing up to the back in stock email notifications which you can find on the product page. This will send you an email as soon as the product goes back in stock so you do not miss the restock.