Well we knew it was coming for about a week now and also knew that if Rovio were planning on doing the Advent calendar type of deal like they have done with the past Winter / Christmas Angry Birds Seasons updates that the new one would have to be available by today and sure enough it is.
The new Angry Birds Seasons update, called Wreck The Halls, has just landed on the Android Market and comes with 25 new levels with presents, gingerbread cookies and bells to get you in the festive mood. Don't forget, of course, the Christmas lights and other goodies that will be there for you to destroy as you fling birds and pigs who are dressed up for the holiday season.
Like previous Christmas updates, it is using the Advent calendar system so each day this month you will be able to play a new level which corresponds to whatever day it is. Of course the last day will be the 25th which, on that day, you'll get to face the big pig himself. Rovio also hints at seasonal surprises in this update so it'll be interesting to see what's in store for all you Angry Birds Seasons fans out there. If you haven't updated yet, go do it!