Yes, they can.
- The student who submits on behalf of the group has the option of adding a comment when submitting. This comment goes to everyone in the group. (This is not a notification, rather, the group members can see this comment in the assignment.)
- Submission details shows the latest file uploaded.
- Every version submitted is stored in the group's files area.
- All students in the group can see the submission, download the submission and see teacher's feedback on the submission.
Instructors will see the latest file uploaded in SpeedGrader. The instructor can also access previous submissions, if any, via a drop-down list.