Today’s discussion should be spent working on your app store proposal, which is due this weekend. You are unlikely to finish this document during this discussion section. We highly recommend that you focus on your description first, as well as the icon design. Everything else (screen shots, keywords, ratings) can wait until later.
It would be a good idea to have a rough sketch of your icon ready to go. That way, the course staff can give you feedback about whether or not it is effective.