I’m looking at upgrading to Advanced from Pro for SSO, but does it offer OIDC support or only LDAP? If only LDAP are there plans to add OIDC? I think true SSO via OIDC would be much preferred to LDAP. Thanks!
Only LDAP at this time. OIDC is planned but part of a larger change to how user creation works.
Is there a general roadmap or plan when that is expected that you can share?
Not that we release publicly I’m afraid 
OIDC is largely implemented and is currently in testing
For completeness: Using OIDC Authentication With AMP and Authentik