The general and most visible new stuff in 4.1 as i can see without the official changelog is that you have a new option, under the "Video" configuration menu.
It's a switch for turning on and off Auto-exposure for the webcams.
Now if only there was somebody to fix those damn crappy linux UVC to support switching off the auto-exposure on every UVC, will be good !
As always in linux... Something is wrong and doesn't work...
But hey - It's free... Haha ( me being sarcastic)