This year Google is coming with lots of new improvements and new features with 2016 Nexus Phones. One of that is New Home button design for an assistant.
New home button is coming with new animation and little colored dots. Android Police Said that: "It is our basic assumption that the reasoning behind the home button's rather radically colorful redesign is in order to promote Google Assistant (possibly via Now / On Tap functions), which has been teased by Google in the past using these four little colored dots."
Here is the First Look of New Animated Home Button:
I found lots of sources for this update. Here is the brief information about this new animated Home button. According to the source, If you switch off the Google Now on the device, the four little colored dots on the home button Go away altogether.
Here, how you can turn on Dots Animation:
Just long-press the home button to turn on the dots animation on your home button.
Here, how you can get this Home button:
I expect this new button to come with 2016 Nexus Phones. But you can this new button on your existing Nexus devices from below.
Just click below to Get this Animated Home Button on your current Nexus Mobile.