The compiled css file generated by the T4 template framework is now used to style editor content when using a JoomlArt template.
I’m upgrading now and look at that possibility...
I’m using Joomdev Astroid, the have only one main compiled css and so far I do my editor.css file manually.
It will be great to be able to use this on other framework than T4 — Possibility to override your component to work with Astroid?