Learn Editor: Update release-notes.md

Author: anosov1960

docs/sql-server/azure-arc/release-notes.md

@@ -30,6 +30,12 @@ Extension versions are cumulative. Higher extension versions include all of the
 
 Extended Security Updates (ESU) subscription for [!INCLUDE [sssql14-md](../../includes/sssql14-md.md)] will automatically start billing when SQL Server 2014 ESU program starts. Requires [!INCLUDE [sssql14-md](../../includes/sssql14-md.md)] be enabled for ESU.
 
+### Extended Security Updates using unlimited virtualization
+
+Extended Security Updates (ESU) subscription for [!INCLUDE [sssql12-md](../../includes/sssql12-md.md)] and [!INCLUDE [sssql14-md](../../includes/sssql14-md.md)] can be activated using ESU p-core license with unlimited virtualization. For details, see [Manage unlimited virtualization benefit for SQL Server ESU subscription](manage-configuration.md#manage-pcore-esu-license).
+
+> [!NOTE]
+> Billing for the ESU p-core licenses will be activated in the next monthly release, but the full ESU costs will be reflected using a back-bill meter.
 ### Azure extension for SQL Server
 
 `SqlServerExtensionPermissionProvider` task no longer runs hourly. The task is triggered by specific events. For details, review [Roles](permissions-granted-agent-extension.md#roles).