Canvas admins and instructors can access the beta environment by adding beta in their Canvas URL (e.g. yourinstitution.beta.instructure.com). The beta environment includes certain limitations as noted in the Canvas guide for each user role:
What happens to my content in the beta environment?
The beta environment is refreshed weekly. Any content added to or modified in the beta environment will be overwritten by content in the production environment every Saturday. Beta is not available for use when the environment is being refreshed.
How do I find out about new features available in beta?
If you want to keep up on the latest beta features in Canvas, visit the Release Notes page in the Canvas Community.