# Product Updates

##### \[ What's launched at LaunchDarkly \]

###### November 18, 2025

###### Feature Flags

# Introducing Flag Delivery v2 (FDv2) for the Python SDK (Early Access)

**Flag Delivery v2 (FDv2)** is now available in **Early Access** for the **LaunchDarkly Python SDK v9.13.0**, bringing faster initialization, smarter data handling, and improved resiliency to feature flag delivery.

FDv2 introduces several key enhancements:

- **Two-phase initialization**: Start quickly from a polling data source, then synchronize from a long-lived streaming connection.
- **Data-saving mode**: Resume from a previously saved state during reconnects to reduce bandwidth and processing time.
- **File-based initialization**: Initialize from a local file first, then connect to LaunchDarkly APIs for updates.
- **Automatic failover**: Seamlessly switch to polling if the streaming connection fails.
- **Improved flag caching**: When using a persistent store in non-daemon mode, flag data is no longer limited by cache TTL.

Together, these improvements make flag delivery faster, more reliable, and more efficient across all environments.

**Availability**

Early Access — Data-saving mode is only available to members of LaunchDarkly’s Early Access Program (EAP). If you want access to this feature, [join the EAP](mailto:product@launchdarkly.com).

**Learn more**

- [Data-saving mode documentation](/content/docs/sdk/features/data-saving-mode#python/index.html)