From now onwards you can update your post without getting it unpublished. It was really a bad thing. Earlier when you started editing your post, it automatically got unpublished. So for that period of time when you were editing, no one could read your post. Or someone with a link to your post would see a "Being edited page". Now you can keep on editing and update your post when you wish. To unpublish, I have added a button on the post page itself.
It was a big change as far as code is concerned so there might be some bugs as well. Please let me know if you find any. I will fix them asap.