It is a bit intimidating for sure... So far the converter tool has only managed to give me a headache trying to figure it out, so I'm glad there's supposed to be more information coming.
I use a lot of custom art for my unpublished full UI (I was about to publish it then they announced a new engine so I held off
), so I'm starting with getting that all happy in the new format, which has been easy enough so far.
I haven't started to play too much with the code, but from my initial look while it's quite different it also feels more intuitive - for simple changes at least.