Woahh... free look/mouse look delay?
 

Did they changed something in the recent GU43 with how the free look works?

It feels like they tried to make it a smoother transition when you look around, but it makes it feel like I'm tripping on something, or my character is drunk :)

I like that it's smooth, but it does make it a bit hard to respond quickly around the screen. Any one else notice this?

Apparently I had "Smooth Mouse" turned on in my Mouse Settings in the Options. However, I've never seen this setting previously, or experienced it.

Is it new, or just random for me?

Smooth mouse has been around for awhile. I use it when I shoot videos in game.