added c++/winrt note to top cpp/cx page

Author: Michael Blome

docs/cppcx/visual-c-language-reference-c-cx.md

@@ -1,23 +1,28 @@
----
-title: "Visual C++ Language Reference (C++/CX) | Microsoft Docs"
-ms.custom: ""
-ms.date: "09/15/2017"
-ms.technology: "cpp-windows"
-ms.reviewer: ""
-ms.suite: ""
-ms.tgt_pltfrm: ""
-ms.topic: "language-reference"
-ms.assetid: 3f6abf92-4e5e-4ed8-8e11-f9252380d30a
-caps.latest.revision: 27
-author: "ghogen"
-ms.author: "ghogen"
-manager: "ghogen"
-ms.workload: ["cplusplus"]
+---
+title: "Visual C++ Language Reference (C++/CX) | Microsoft Docs"
+ms.custom: ""
+ms.date: "09/15/2017"
+ms.technology: "cpp-windows"
+ms.reviewer: ""
+ms.suite: ""
+ms.tgt_pltfrm: ""
+ms.topic: "language-reference"
+ms.assetid: 3f6abf92-4e5e-4ed8-8e11-f9252380d30a
+caps.latest.revision: 27
+author: "ghogen"
+ms.author: "ghogen"
+manager: "ghogen"
+ms.workload: ["cplusplus"]
 ---
 # Visual C++ Language Reference (C++/CX)
 
 C++/CX is a set of extensions to the C++ language that enable the creation of Windows apps and Windows Runtime components in an idiom that is as close as possible to modern C++. Use C++/CX to write Windows apps and components in native code that easily interact with Visual C#, Visual Basic, and JavaScript, and other languages that support the Windows Runtime. In those rare cases that require direct access to the raw COM interfaces, or non-exceptional code, you can use the [Windows Runtime C++ Template Library (WRL)](../windows/windows-runtime-cpp-template-library-wrl.md).
 
+> [!NOTE] C++/WinRT is a new, standard C++17 language projection for Windows Runtime APIs. It's available in the latest Windows 10 SDK from version 1803 onward. C++/WinRT is implemented entirely in header files, and designed to provide you with first-class access to the modern Windows API.
+
+> With C++/WinRT, you can both consume and author Windows Runtime APIs using any standards-compliant C++17 compiler. C++/WinRT typically performs better and produces smaller binaries than any other language option for the Windows Runtime. We will continue to support C++/CX and WRL, but highly recommend that new applications use C++/WinRT. For more information, see [C++/WinRT](https://docs.microsoft.com/windows/uwp/cpp-and-winrt-apis/index).
+
+
 The new model represents the next generation of native C++ programming on Windows. By using it, you can create:
 
 - C++ Universal Windows Platform (UWP) apps that use XAML to define the user interface and use the native stack. For more information, see [Create a "hello world" app in C++ (UWP)](/windows/uwp/get-started/create-a-basic-windows-10-app-in-cpp).