Another change I haven't seen mentioned...
They fixed the really irritating frontlight behaviour!
(See here for the way it used to act).
It now works in a much more sensible way. Using the edge-swipe gesture, you can only set the light between 1%-100%. This is sensible, as it stops you accidentally killing the backlight in the dark. It also allows you to easily set the backlight to the minimum value.
To turn it off, you can use the popup brightness menu - this now lets you set it to 0% instantly, without the weird delay which used to exist.
Most people didn't seem to care about this too much, but I found the old behaviour extremely irritating. I'm very pleased with how it works now.