It so looks like they have their own Customized Version of the Winter Wonderland that sometime soon players will get to visit, and in doing so will get them that Yeti.
And It appears just going to the Wonderland between the 5th of December and 31st will Net the Ice Castle.
Now the Real trick is if this is a World Wide Promo or not.
To fully Expand a Sleigh It looks like you are going to need:
74 Milk and Cookies
74 Reindeer Treats
74 Holiday Cheer
32 GPS
32 Jingle Bells
32 Holiday Lights
You likely will be better off building a bunch of the Level one sleighs instead of having to get so many parts to fully expand one, similar to the HoeDown Barn.
Well This is what those 6 new building Materials on the Gift Page are for. I'll have how many of each you need plus Send/Request links up in a bit.
Check out how long this thing is!
This is like the Hoedown or the Duckulas Castle, it will be harvested to get Stuff for whatever thing is used for the Event bucket.
Likely it'll harvest for some sort of Present, and the more leveled up you get the more you get, and next week you can go harvest your friends Sleigh!