This is for some S5s in Poland at present, expected to roll out world-wide in months.
I received it on my 2014 Moto X yesterday.
I've had it on my Nexus 5 for awhile now. It's definitely a major and much needed update. It's the little things that make it nice
Still waiting for mine on my S5 on verizon
It's great. I updated my nexus 5 when I wiped it for my girlfriend's use. I agree that there are a lot of little things that make it lovely. I do wish they had a feature like CM to just have a notification light for battery charging, as we had several nights where the wireless charger didn't quite align and she woke up to go to work with super low battery.