I'm not sure many people noticed, but the Part 3 page mentions that there will be DOZENS of sets within the chest that they are releasing along with this event. Surely there are lots of sets in it because many community members made great sets, but this could also be a new attempt at retaining the value of each set involved. It makes sense from an economic point that it will take people a lot more money to drop each set from the chest, therefore purchasers will value their sets much more.... hopefully.
that'd be awesome, though the reddit post about the update kind of implied that they were older sets kind of like the nestled cache one currently for sale.
I wish valve would just tell us which got in already, the wait is killing me