As for Xam’d… Things do seem to be progressing in terms of actual plot, more on the Sentan island side than Akiyuki’s side, but in terms of explanations its still a black box. They do seem to be slowly adding more and more mysteries and dropping hints or clues to some of the mysteries but overall still an enigma. While it probably won’t end up like Darker than Black, seeing as this isn’t a bunch of bi-arc episodes so they actually have room to work on, I do hope they plan on answering the many questions. Like what the heck is that cute transparent glass like creature than the people of Nakiami seem to be growing.