Noticeable visual updates and a few under-the-hood changes as well
The Stable channel of Chrome OS has just been bumped to 31.0.1650.61, bringing several user-facing changes. First up is more customization of the Shelf (the status bar and dock at the bottom of the screen), which can now be moved to either the left or right side — It can still be auto-hidden as well.
In the Shelf you'll also notice the app launcher has been pinned to the leftmost spot (or topmost if the Shelf is side-mounted) so that it doesn't move as you add more pinned apps to the Shelf. The launcher icons, app icons and status tray have also been slightly redesigned to be more touch friendly. A nice little visual touch can also be seen in your profile picture for logging in changing to be in sync with your Google+ picture, if you've chosen to have that feature.
This latest release of Chrome OS is available for all Chromebooks out there, except for the original Acer C7, the HP Chromebook 11 and HP Pavilion Chromebook. Your Chrome OS device will pull down the update automatically, or you can always check for the update manually by typing chrome://help in the URL bar.
More: Chrome Releases