In the Quebec release of Change management, what new architectural features were added?

Catalog Builder is a Service Catalog tool unrelated to Change Management architecture, and while Change Designer exists, it was not introduced alongside Catalog Builder as a Quebec pairing.

Change Approval Matrix is not a named architectural feature introduced in the Quebec release; approval logic is handled via Change Approval Policies and Decisions, not a matrix component.

In the Quebec release, ServiceNow restructured Change Management around three new architectural pillars: Change Models define the template and behavior for a change type, Change Flows replace legacy workflows as the automation engine, and State Transition Models govern how records move between states. These together replaced the older workflow-centric architecture with a more flexible, configurable system.

PIR (Post Implementation Review) Assessments and Change Approval Policies existed before Quebec and were not the primary new architectural additions of that release.