Widget for Google Now mentioned on support page
Even though the Google Now widgets are prominently mentioned on the support page, how they are getting to your phone remains a mystery. It could be part of an OS update, or an update on Google Play. Going with the latter would make more sense since not all models have the OS build that might be updating. The widgets appear to show a summary of your Google Now cards on your home screen or lock screen.
Google Now is one of the main features found on Android 4.1 which is one of the reasons that many Android users can't wait for their next update.
source: Google via AndroidCentral