The preorder in this case was all about timing. When we saw Natalia's art for this deck, we loved it, and thought it deserved a USPCC run.
However, with prepress, proofing, and production we knew we would be able to have the deck done JUST in time for Christmas. The preorder is so that folks have enough time to order ahead of Christmas, but it also helps logistically. Our warehouse team can prepare labels and other things from preorders so that decks can start going out to door to customers the same day that the decks hit our warehouse.
If we'd put the deck up for sale when they hit our warehouse, it would've taken that extra day or 2 to get them into customers hands, and we want to do everything we can to put these in your hands before Christmas.
We also didn't want to put them up for preorder too early. USPCC runs are subject to a plus/minus 10% over or under-run, so we needed to be at the tail end of production to make sure everything went correctly with the run and that there were no major glitches or anything like that.
Hope that makes sense and sheds some light on things. The decks are in transit to our warehouse as we speak and will be shipping out to everyone soon.