My first reaction to the design was that it is absolutely beautiful and likely very functional as well. My second reaction was that "Number of articles deleted" should be added so that we could see "net new articles" as well. But it appears that those numbers can be backed out very easily from the previous periods data (please let me know if that assumption wouldn't work for any reason).
Perhaps it's too much too ask for, but several Wikis now have ORES scores calculated every month. For those wikis could you post average ORES scores? I like the numeric scores better than the class scores, but including either (or both) here would be an improvement. Maybe even scores for old articles, new articles, and deleted articles?