Google rolled out a few changes to Classroom earlier this week. You can now
- Restrict students from posting and comments.
- Change the sorting order to last name.
- Have assignments marked as done (when there is no product to turn in).
- Download multiples assignments grades at once.
- Invite students based on groups.
- Show deleted items in your stream.
Here is a great video from Aaron Svobada as he walks through the changes.