Default Google Now Launcher (Officially) available to all Android devices running 4.1 & up

As of version updated On August 1 It is now released to us with Galaxy Devices.
Of course there were ways to get this before, but now we can get updates faster and easier straight from google.

Play Store Link:

Also a nice way to CUSTOMIZE the Now Launcher is through this free app that requires you to be rooted and have Xposed Framework :