Google has added an auto sync feature to Google Drive for all documents, sheets, and slides today as well as the ability to view all documents when the user is offline. Few hours before that Google Drive got  profile pictures and one-click group chat.

Google announced it on a Google+ post

If you’ve set up Google Drive offline, you can now create and edit drawings offline. In addition, all of your Google Docs, Sheets, and Slides will now be automatically available offline (space permitting), so you won’t have to worry about remembering that specific file before catching your flight!

It may take a few days to see these changes as we complete the rollout. If you haven’t used offline yet, give it a try today: http://goo.gl/4BgYa