The other major improvement I see is the updated notifications and quick settings shade available from the top of the device. (zdnet.com)
There is also a new quick settings shade for instant actions, while the Google Fit app has also been significantly improved, though the Watch Sport is the more suitable device to give you a better idea of your activity progress. (pocket-lint.com)
You can now switch faces with a swipe - as you can on Apple Watch - there's a new quick settings shade for instant actions, as well as deeper focus on fitness. (pocket-lint.com)