I too really like the new UI!! Very nice! I would also agree with Romullus' last post comments.
Currently really testing out the new Interactive mode and WOW it's truly amazing! Having so much fun with it! By far the best interactive render implementation I've seen yet! Thea's may still be a bit better in few small ways (like the sketchup implementation you can make the main window interactive and even still work directly in it!). But, overall, Corona's is far more powerful and feature complete! I just can't believe you'd doing all this with only the CPU! Amazing!
FYI, so far so good for the new build, nothing major so far. A few "weird behavior" things but still exploring them.
Also, I've never noticed this up til now but I see Corona is having the same issue many other renderer do with smooth faceted curves/sphere (edge termination, or whatever it's called). I know the Maxwell/Thea/Fry engines have been able to solve this. Is this a new issue? (see attached leaf image)