We’ve also added discussions to the editor just like in Docs. You can: Comment on a shape or an entire slide to give context to your discussion. Send an email notification by adding someone to a comment.
Resolve comments to let collaborators know that they’ve been addressed, and to reduce clutter in your presentation. Plus, to make it easy to get feedback without giving up control of who can make changes, you can now give others the ability to comment on (but not edit) your presentation.
If you’d like to convert existing presentations to the new version of the editor, create a new presentation and import your slides by selecting “Import slides” from the “File menu.” To learn more about how to import your old presentations, check out these instructions.