I have heard a presentation by Ashok Goel where he shared experience of having an AI as a teaching assistant in his MOOC on Coursera. I will be pleased if it is smth you are looking for. Here is an article about that experiment: http://www.news.gatech.edu/2016/05/09/artificial-intelligence-course-creates-ai-teaching-assistant
Thank you for your answer! I was not aware that somebody worked to develop knowledge base for Watson on the e-learning segment. It is very useful to me to see the timescale and the result they obtained.