How do I see the queue of untagged faces in the 2015 Mac Photos App? In the old iPhoto, I could go to a screen to see a queue of faces that hadn't been tagged, with tag suggestions. 

In the 2015 Photos App, whilst I can tag photos, I can't find the bit where I get the tag suggestions, where you can see the queue of untagged faces.

My question is: How do I see the queue of untagged faces in the new Mac Photos App?
Albums > Faces - the pending list should appear at the bottom of the page, if there are any new faces to tag.