Looks like a strong start to some much needed organization tools, but I see an issue developing already. This will, after time, just become a more organized extension of the "assignments" app, wherein a teacher will collect NUMEROUS postings, and could become overwhelmed. Will Microsoft consider adding super- and sub-class options, so that we can group modules/units into larger lessons? For example, if I am teaching AP World History, I would want to break my lessons and activities into time periods, and within those time periods I may explore different cultures. I believe adopting this level of organize would save many headaches down-the-line, especially if introduced now rather than later.
Additional example for clarity: I have a super-module titled "1200-1450 C.E." that I want to post and make active to the class. Then, within that super-module I have sub-modules that I can have independent release times for. This allows a more controlled release of content, and students would have a larger idea of which lesson they are currently in, while also being able to focus on categorized activities within those units.