Autumn is my favorite season, too (in part because it has my favorite holiday - Halloween!). I squeed this morning when I saw the sweet olive and the change in grass/trees.
I just noticed it when I opened up the game this afternoon. I do think it looks really lovely myself and I'm looking forward to seeing how else it'll change in the future.
I actually find the fruit trees even prettier this way.
I wish it just jumped to the orange, the intermediate stages are such yucky colors imo. I still don't really like autumn's orange as much as the greens of spring and summer or the white of winter though, but just the yellow-greens are really yucky and probably the worst part about autumn for me. :<