Your product is only getting better! I think the Student Mastery Reporting function is going to a very important tool for many institutions.
One thing that it is missing, however, is an export and print option. It would be great to be able to export learning outcome assessment data as a .csv or .xls file for easier upload to institutional and system databases.
A feature like this will differentiate Schoology from other CMSes (and LMSes) out there.