In the new editing experience, Knak has made some changes to the way you approve and discuss emails amongst your team. Please note this is an Enterprise only feature.
Both approvals and collaboration can be found under the collaborate tab at the top of the new editing experience. You can access that by opening any email built in the new editor.
Here you can see full details of who has/has not approved the email so far, including comments left by the approvers.
Pro Tip: When setting up approval groups you can now set multiple approvers per stage to save time. More details here.
This is a completely new section where anyone can leave a comment, not just approvers. You can reply to a previous comment or start your own thread.