Hello! Yeah this is a very recent change so not many playgrounds with this feature, so I created this one: Animated Button example | Babylon.js Playground (babylonjs.com). What the IAnimatable means is that you can now use the features of the Babylon animation system Animation | Babylon.js Documentation (babylonjs.com) with GUI controls.
This should also mean the Animation Curve Editor: ACE - The Animation Curve Editor | Babylon.js Documentation (babylonjs.com) which is a graphical tool to create and edit animations, but it seems we haven’t added yet the button to open ACE on the GUI elements, so I’ll look into this now.
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