There are a few changes to the curriculum, and we'll give a more detailed update on it when we broadly announce the new version. In Unit 1, a lesson has been switched out and there have been a few revisions. Units 2 and 3 have also seen some revisions to a few lessons, and we have added in more resources for students in the programming challenges. We've also added in extra challenges in Unit3. The revisions to Units 4-6 are still ongoing.