When you open minecraft in the Launcher you can see 1.4.6 Update.NEw feature, christmas surprise. Whats that? you wonder, well i got the awnser its already 24th here and this happens in the 24th and 25th in your local time where minecraft looks if thats the current date, you can "cheat" into this if you change your time and date.
Finaly, heres the picture:

Spoiler

 

Note:The picture is our towns christmas tree :p