The Alternate Chrome OS Shelf Design has been enabled by default in the last Dev Update.

As you can notice in the screenshot below, the App Launcher Icon is now the first item and blueish when highlighted.

Moreover, adjusting the Shelf Position has also been enabled. Right-clicking on the Chrome OS Wallpaper will let you set your shelf to the left, bottom or right side of your screen. 

Source: https://codereview.chromium.org/22793011
Photo
Shared publiclyView activity