On the student snapshot that opens when you select a name or grade box in the new grade book a number of missing assignments is displayed. However, it will only count the number of missing "online" or "external tool" assignments. "On Paper" and "No Submission" assignments are not included in the count. In K-12 this needs to be an accurate count for teachers and parents. Please have this count include the total number of missing assignments instead of only the digital kind. Or have the option to include both in the count.
Second to that would be the ability to create a report of missing assignments a student has in the course. Here is a similar idea that has been up for vote: Missing Assignment Report. Please go vote this up as well!