What's new add experimental features

Author: Julia Schwarz

Documentation/ReleaseNotes.md

@@ -106,12 +106,35 @@ A hand physics extension service has been added to allow for using physics inter
 
 ![Hand physics](https://user-images.githubusercontent.com/1186832/68795768-77efdc00-0606-11ea-8fb9-b0e4191bdb05.gif)
 
+**Non-native keyboard (Experimental)**
+
+A keyboard that can be used on platforms which do not provide native keyboard support.
+([#6492](https://github.com/microsoft/MixedRealityToolkit-Unity/pull/6573))
+
+<img src="https://user-images.githubusercontent.com/168492/73916489-5b181d00-4872-11ea-9c1e-7ef6738a9f6f.png" width="400">
+
+**Hand coach (Experimental)**
+
+Hand animations that can give helpful hints for gestures users should perform.
+A ([#6493](https://github.com/microsoft/MixedRealityToolkit-Unity/pull/1493))
+
+<img src="https://user-images.githubusercontent.com/168492/73916521-771bbe80-4872-11ea-80ce-c117253e3c24.png" width="400">
+
+**Follow solver (Experimental)**
+A solver that matches HoloLens 2 shell behavior. ([#6981](https://github.com/microsoft/MixedRealityToolkit-Unity/pull/1493))
+
+<img src="https://user-images.githubusercontent.com/47415945/71829132-d338ca80-309b-11ea-97eb-9afc341a21ed.gif" width="400">
+
 **Pinch Slider orientation**
 
 The Pinch Slider has been updated to orient TrackVisuals, TickMarks and ThumbRoot based on the sliderAxis orientation ([#6858](https://github.com/microsoft/MixedRealityToolkit-Unity/pull/6858))
 
-![Y axis slier](https://user-images.githubusercontent.com/42405657/71687606-37a31380-2d96-11ea-84b5-ffe2368f8b57.JPG)
-![X axis slider](https://user-images.githubusercontent.com/42405657/71687640-4984b680-2d96-11ea-9f59-7732a91edd1b.JPG)
+<img src="https://user-images.githubusercontent.com/42405657/71687606-37a31380-2d96-11ea-84b5-ffe2368f8b57.JPG" width="150">
+<img src="https://user-images.githubusercontent.com/42405657/71687640-4984b680-2d96-11ea-9f59-7732a91edd1b.JPG?s=25" width="150">
+
+**ObjectManipulator and BoundsControl (Experimental)**
+
+ObjectManipulator and BoundsControl are refactored versions of ManipulationHandler and BoundingBox, respectively. They are designed to be simpler to configure, use and maintain. We are hoping to eventually deprecate ManipulationHandler and BoundingBox in favor of these more robust components.([#6294](https://github.com/microsoft/MixedRealityToolkit-Unity/pull/6924))
 
 ### Known issues in 2.3.0