In forms there is currently the ability to allow someone filling out the form to save the form and complete it for later. This requires them to input their email address and a password and then a link is emailed to them.
I think that is great for Public users, but for users that are logged into Forms it would be great if when they select to fill out later that it saves it in a Draft section for them so they can simply log back into Forms and see their drafts without having to dig through their email and trying to remember a password to retrieve it.