AlphaGo defeated Lee Sedol again last night. BBC has a nice story about the game. It looks like AlphaGo's moves in this game were a bit less shocking to the 9-dan champion Lee. My second-hand perspective on this is a bit dire; I'll admit that I'm rooting for humanity here. If Lee has a hard time reviewing this game and figuring out where he might have made some grand mistakes, the likelihood of improvement in the next two days (before the next game) is low. Unless he can spot a weakness in AlphaGo's play, the Holy Grail of Go might fall.
YouTube has a video of the second game.
Good luck to Lee in the next game!
2 weeks ago