Google added a new keyboard shortcut to help users more quickly jump their cursor in the search entry box. If you do a search on Google.com and start typing afterwards, Google will prompt you about this keyboard shortcut that reads “Press [/] to jump to the search box.”
Here is a screen shot (click to enlarge):
This was first covered by 9to5Google but Shameem Adhikarath also notified me of this on Twitter.
Google also shared this news on Friday afternoon:
Forum discussion at Twitter.