Update whats-new.md

whats-new.md

@@ -28,7 +28,7 @@ The Bot Framework SDK v4 is an [open source SDK][1a] that enable developers to m
 The Bot Framework SDK v4.6 release fully integrates support for building Teams bots allowing users to use them in channel or group chat conversations. By adding a bot to a team or chat, all users of the conversation can take advantage of the bot functionality right in the conversation.  [[docs][00] | [C# sample][00] | [JS sample][00]]
 
 ### Bot Framework SDK Skills (Preview)
-Create a reusable conversational skill to add functionality to a bot. Leverage pre-buit skills which include: Calendar, Email, Task, Point of Interest, Automotive, Weather and News skills. Skills include language models, dialogs, QnA, and integration code delivered to customize and extend as required. [[SDK Link]()]
+Create a reusable conversational skill to add functionality to a bot. Leverage pre-buit skills which include: Calendar, Email, Task, Point of Interest, Automotive, Weather and News skills. Skills include language models, dialogs, QnA, and integration code delivered to customize and extend as required. [[download]()]
 
 ### Adaptive Dialog (Preview)
 Adaptive Dialogs enable developers to build conversations that can be dynamically changed as the conversation progresses. It allows developers to dynamically update conversation flow based on context and events. This is especially handy when dealing with conversation context switches and interruptions in the middle of a conversation. [[docs][48] | [C# samples][49]] 
@@ -37,9 +37,8 @@ Adaptive Dialogs enable developers to build conversations that can be dynamicall
 Language Generation enable developers to separate logic used to generate bot's respones including ability to define multiple variations on a phrase, execute simple expressions based on context, refer to conversational memory. [[docs][44] | [C# samples][45]]
 
 ### Common Expression Language (Preview)
-- [Common Expression Language][40] | [api][41] :: Both Adaptive dialogs and Language Generation rely on and use a common expression language to power bot conversations.
-    - New prebuilt functions (jpath, eval)
-    - Stability improvements and bug fixes.
+Bots, like any other application, require use of expressions to evaluate outcome of a condition based on runtime information available in memory or to the dialog or the language generation system. Common Expression Language addresses this core need as well as provides a common language that can be used across Bot Framework SDK and other conversational AI components that need expressions. Both Adaptive dialogs and Language Generation rely on and use a common expression language to power bot conversations. [[docs][40] | [api][41]]
+
 
 [40]:https://github.com/Microsoft/BotBuilder-Samples/tree/master/experimental/common-expression-language#readme
 [41]:https://github.com/Microsoft/BotBuilder-Samples/blob/master/experimental/common-expression-language/api-reference.md