Jen's take: Age old instructional "model" of (1) Presentation, (2) Practice with both online exercises and hope to flip classroom model with time in class for practice not lecture, (3) guidance / feedback with focus on mastery with integrated analytic and "badges" based on gaming concepts. No current focus on credentials. Hope for global classroom. A lot of tried instructional concepts on self-paced learning, but sparkle here is each of the three elements (presentation, practice, guidance / feedback) are done by a really smart dude. Can it scale? Is there "enough" content beyond bites of important concepts? Heavy focus on learner-content interaction (and to some extent learner-teacher interaction in terms of designed instruction), but what else is required (learner-teacher interaction or learner-learner interaction) for practice / guidance beyond online experience?