Funny I didn't notice that since I've been using the lastest Beta. However I have been much happier with the release, eye strain is down, I think they changed a few things with regard to legibility, glad Apple is listening.
One other thing I noticed is that the screen brightness auto adjust is better. Its awfully subjective, but at the end of the day it seems to make more accurate changes with varying light sources. I keep all the default settings for the display, BTW, test as is.