So, in terms of mystery unlocks, I don't have too much to add from what I brought up on the discussion page for Christmas 2019, I think. Possibly we might get a new carving option at the Piled Blocks Of Ice. No guarantee, but it sounded like the plan was to be able to eventually add more stuff there. On that note, if you don't have unmelting ice bricks left over from last year, you might want to stock up on those. Took 4 for each swan to be carved.
Christmas 2020 / Discussion
This is the discussion related to the wiki page Christmas 2020.