I'm a huge fan of this redesign. It's so much cleaner and simpler to use. I really hope there are more updates planned in the near future
Does anyone know if Oskar Krawczyk is the original founder? I don't know much about JSF but it's been around for so long, I'd love to know more about the team.
I probably would have kept the top bar blue. Gives it a little more contrast. Still a huge improvement though.
But perhaps best of all is the async update. Every time you write some code or save/fork a fiddle, these updates will synchronize automatically to show results instantly.
I'm not sure if the author actually got it right on this part thou. The async has nothing to do with writing code and updating the preview, like on Codepen. Still happens only on save, unfortunately.