From the Official Google Blog:
You can even prioritize a device, so that your most important activity — like streaming your favorite show — gets the fastest speed.[Clip]OnHub makes it simple to set up and manage your Wi-Fi, all from the Google On app, available on Android or iOS. The Google On app tells you how much bandwidth your devices are using…Starting today, OnHub is available for pre-order for $199.99 from online retailers in the U.S. including the Google Store, Amazon, and Walmart.com. It will be available for sale in retail stores in the U.S. and in Canada in the coming weeks.