Multi-Tenant Organization Preview in Microsoft 365

Pretty excited to hear about this new feature what it offers for organizations with multiple tenants. As I understand the foundation is cross-tenant synchronization in Entra ID, will multi-tenant organization also support adding "sovereign cloud" tenants as a member organization? As an example, the owner tenant housed in the US and a member tenant housed in 21Vianet or US sovereign (e.g., GCC).

Curious to hear any insights! ^_^