I'm on the beta now. It really does feel like an official release.
I know it's early days, but normally with previous Android betas I end up rolling back quite quickly as it feels janky and, well... beta-ish.
I love the power button menu now. Having access to all of my Hue lights is great.
The ability to screen shot from the open apps screen is amazing and editing a screen grab is the most fluid it has ever been. And no more screen shot notification!
The new media controls are also great.
And I love the control panel like settings menu with the Bluetooth and WiFi details.
Loving it so far.