I got into the demo over the summer, and I was pretty underwhelmed. They list the features on the front page there, and that's exactly what they have. So in other words, you can manage a feed of assignments ("X is due on Tuesday", "Here is a link to a video!") and some very simplistic google docs control. I really expected something on the level of Canvas or Moodle, but it's clearly just a few convenience features for running GAfE.