There will be 3 autosave slots where you can choose the intervals in which it saves ranging from 5 - 10 - 15 minutes. In a hands-on preview the previewer stated "I got stuck in one place and couldn't move forcing me to reboot the game". Why would he need to reboot when this new autosave feature is implemented?
I know this isn't exactly a huge info reveal but I thought I would share it anyway. If you want the source, look up @DCDeacon on Twitter.