You can experience Pixel Launcher on your Android phone right now by installing latest Beta version (5.0-beta1) of Nova Launcher. A leaked version of Pixel Launcher is already available for download, but if you are a fan of Nova Launcher, you can experience Pixel Launcher right now by updating to latest beta version.
Below are the main changelog of Nova Launcher 5.0-beta1 In order to get Pixel Launcher look, you have to configure Nova Launcher. First, update it to latest Beta version (5.0-beta1) by going to Settings > Nova > Check for update. After updating, just do as given below.
How to Configure Nova Launcher to get Pixel Launcher Style
Open Nova Launcher Settings > Desktop > Indicators > Page Indicator > Line
Settings > Desktop > Indicators > Swipe to drawer indicator
Settings > Desktop > Search bar > Pixel style
Settings > Drawer > Swipe to open
Settings > Drawer > Card Background > Off
Settings > Drawer > Background Color > White
Settings > Dock > Background > Rectangle, Color White, Transparent 100%, behind Navbar
Settings > Folder > Folder Background > N Preview Note: To get latest beta version, you need to sign up for beta testing. If you have not sign up for beta testing, just go here, sign up and then download it from Play store here. (Source)