Some of these features are in “preview” or “development.” What does that mean?

Features in "private preview" are typically available to a limited set of customers for testing and feedback. "Public preview" means the feature is more broadly available for testing but may still undergo changes before general availability. "Generally available (GA)" means the feature is fully released and supported for production use. Features "in development" are planned but not yet available. As with any forward-looking statements, actual product offerings and timelines may differ.