Teams will be available as part of Office 365 for U.S. Government G1, G3, G5 and F1 plans. It also will be available for Microsoft 365 for U.S. Government G3, G5 and F1 plans. Microsoft officials said they "are working to bring Microsoft Teams to the other U.S. government clouds soon."
Microsoft's Stream video service for business users still isn't available for U.S. Government cloud, which means call/meeting recording in Teams is not yet available either, as it uses Streams. Support for apps (Bots, Tabs, Connectors) is a work in progress, as are unified presence and email notifications.
New features for Microsoft Teams will come to Government Cloud customers after they first go to commercial customers, going forward. Microsoft officials said this lag is "due to increased audit requirements and activities to meet the needs" of that environment.
Microsoft Teams security and compliance levels include ISO 27001, ISO 27018, EUMC, SOC 1 Type I & II, SOC 2 Type I and II, HIPAA and FedRAMP Moderate, Microsoft's blog post notes.