Hey there!
Now that the docs are there, we can finally announce a very cool new feature coming on 5.0! The first one I worked on as part of the team, so I love it even more! 
That is… THE ANIMATION CURVE (ACE) EDITOR!
Brought to you by the master himself @Deltakosh and Padawan @carolhmj, this tool aims to help you create amazing animations without ever leaving your scene! @PirateJC has written an amazing doc page about it, and I strongly encourage you check it!
ACE - The Animation Curve Editor | Babylon.js Documentation
But the TL;DR version is, you can access the tool through the inspector by the “Animations” property in an object:
Or by animation channels:
When you open it, you’ll see this beautiful interface designed by @PatrickRyan:
With buttons for creating, loading and saving an animation. And yes, you can save the animations you create there to either a file or the snippet server, and use it however you want!
The interface provides you with controls for creating/deleting keys, editing key values/tangents/different tangent modes, stepping frame by frame or key by key, playing, pausing… there are a TON of ways to interact with your animation!
I won’t go into details about the individual features because of the doc (give it some love!), but I’d love to see the forum users get into the feature and give us feedback. The editor is still subject to change, so if you think there is anything we can improve on, if you find something isn’t working how you’d like to, please let us know! I want this editor to grow a loooot with our users’ experiences of it. 
Peace!