So I remember last Christmas we got a surprise of weather (including snow). That was awesome! What I'd love to see is the xmashat getting fixed. it's buggy at the moment. I'd also love to see a version of the Christmas tree light up and middle-click on it to get the menu (like when you open animal inventories) and get an option to switch between multi-color or white, and solid or flashing.
If its feasible to modify the tree on such short notice. this would be really cool