The one I'm most interested about is the 5v1 match (which may be what they were referring to?). If AlphaGo wins that one, then it's basically over.
I wouldn't look at it that way. Are five heads playing a single game of Go really better than one? I imagine there would be plenty of disagreements about moves and tactics.
There was a lot of talk in the Go world that the time controls for that game were too short; not enough time for discussion, etc.
It'll likely lose that game as well. Frankly Humans can't be 'boosted' so easily (unless the pros know something I don't).