It's intended that the object bar entirely replace the object list in the layers bar. Since the object list in layers was quite buggy, it was removed when the object bar was functional - but you're right, there's no longer an equivalent to Z ordered view. I think we plan on re-adding features like sorting by Z order to the object bar before 1.0... in the meantime, you can either go back to an old build if it's that important, or just hold on a bit longer