This is a linkpost for http://www.sixthtone.com/news/mysterious-go-master-blitzes-competition-rattles-game-community
Summary: A Go player with the username 'Master' has appeared on Go websites such as Yicheng and Yehu this month. They have repeatedly won against multiple world champions. Commentators suspect Master is a software system similar to or related to AlphaGo.
It's AlphaGo, a buddy in Google is talking about how it has a match lined up next year, but that will probably be the last one.