SP 13 is a maintenance service pack that includes a minimal set of new features along with a number of fixes and improvements. The following features are new to SP 13 and do not appear in SP 12.
Align Rubric Row Criteria to Goals
Building Block Dependency Management
Exporting Test Questions
Institutional Hierarchy Tool Setting Override
Learning Tools Interoperability (LTI)
Progress Tracker
Staging Cloud
Test Access Log