update release notes

Author: eric-urban

articles/ai-services/speech-service/includes/release-notes/release-notes-containers.md

@@ -2,10 +2,23 @@
 author: eric-urban
 ms.service: azure-ai-speech
 ms.topic: include
-ms.date: 8/7/2024
+ms.date: 9/17/2024
 ms.author: eur
 ---
 
+### 2024-September release
+
+Add support for the latest model versions:
+- Speech language identification 1.15.0
+    - Mitigate Vulnerabilities
+- Neural text to speech 3.4.0
+    -  New voices: `en-us-andrewmultilingualneural`, `en-us-jessaneural`, `es-us-alonsoneural`, `es-us-palomaneural`, `it-it-isabellamultilingualneural`
+    - Mitigate Vulnerabilities
+- Speech to text 4.9.0
+    - New Locales: `ar-YE`, `af-ZA`, `am-ET`, `ar-MA`, `ar-TN`, `sw-KE`, `sw-TZ`, `zu-ZA`
+    - Mitigate Vulnerabilities
+    - Update Deprecated Models
+
 ### 2024-August release
 
 Add support for the latest model versions:
@@ -15,7 +28,7 @@ Add support for the latest model versions:
 - Neural text to speech 3.3.0
     - Upgrade .Net 8.0
     - Mitigate Vulnerabilities
-- Speech to text 4.18.0    
+- Speech to text 4.8.0    
     - Upgrade .Net 8.0
     - Mitigate Vulnerabilities
     - Upgrade Recognition Engine

articles/ai-services/speech-service/releasenotes.md

@@ -7,7 +7,7 @@ author: eric-urban
 ms.author: eur
 ms.service: azure-ai-speech
 ms.topic: release-notes
-ms.date: 6/6/2024
+ms.date: 9/17/2024
 ms.custom: references_regions
 ---
 
@@ -17,6 +17,7 @@ Azure AI Speech is updated on an ongoing basis. To stay up-to-date with recent d
 
 ## Recent highlights
 
+* Fast transcription now supports Diarization to recognize and separate multiple speakers on mono channel audio file. For more information, see [fast transcription API guide](fast-transcription-create.md#use-the-fast-transcription-api).
 * Video translation is now available in the Azure AI Speech service. For more information, see [What is video translation?](./video-translation-overview.md).
 * Personal voice is now generally available. For more information, see [What is personal voice?](./personal-voice-overview.md).
 * The Azure AI Speech service supports OpenAI text to speech voices. For more information, see [What are OpenAI text to speech voices?](./openai-voices.md).