Advanced features for sharing content without logging into MyDrive. You can now adjust the permissions on the shared folder. The following three options are available to you:

• Download
  The contents of the shared folder can be viewed, downloaded and played.
   
• Upload
  The content of the shared folder remains invisible to friends.
  However, friends can upload files and folders.
   
• Upload & Download
  The contents of the shared folder can be viewed, downloaded and played.
  Files and folders can be uploaded.

More info can be found here.