Merge pull request #3443 from sydneemayers/docs-editor/whats-new-1741628151

add spillover to what's new

Author: prmerger-automator[bot]

articles/ai-services/openai/whats-new.md

@@ -21,6 +21,10 @@ This article provides a summary of the latest releases and major documentation u
 
 ## March 2025
 
+### Provisioned spillover (preview)
+
+Spillover manages traffic fluctuations on provisioned deployments by routing overages to a designated standard deployment. To learn more about how to maximize utilization for your provisioned deployments with spillover, see [Manage traffic with spillover for provisioned deployments (preview)](./how-to/spillover-traffic-management.md).
+
 ### Specify content filtering configurations 
 
 In addition to the deployment-level content filtering configuration, we now also provide a request header that allows you specify your custom configuration at request time for every API call. For more information, see [Use content filters (preview)](./how-to/content-filters.md#specify-a-content-filtering-configuration-at-request-time-preview).