Records Management Capability in O365

Depends on what you mean by "full" I guess, full in terms of workloads/items supported, full in terms of features, full in terms of meeting all (or some specific) regulations, etc. The documentation doesn't go into too much detail, but it should be able to answer the most common questions: https://docs.microsoft.com/en-us/office365/securitycompliance/labels#using-retention-labels-for-records-management

For additional details and coming features, the sessions from Ignite are usually the best source. You can also check the Microsoft 365 Roadmap.