Merry Christmas!
The "big update" will come next year, 'till then here is a "little" surprise for you, but only if you were good this year! ;)
Old saves should work, if you have any problems with loading a save, going back to the main menu and loading it from there could help.
If you don't want winter, you can always switch back to older versions:
Thanks for a few textures to DotterG, who made the winter mod previously!