This is another breakthrough once again by Mr Musk. I am not sure why this is said to be more complicated than go. I would say the opposite (and this statement may be a little bit propagandish :p )
In any case, I am wondering what will happen for the 5 vs 5 match. On the one hand, the AI will have to handle the human players, but on the other hand they will have to communicate with each other and make common decisions. This looks to be very interesting :)