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Look at what he said about Sasuke. I highlighted the box in red.
I can understand how he knows about Pein, because he helped create him with the help of Hanzou.
What I can't seem to grasp, is how he knows all about Sasuke? How does he know that Sasuke has "secret motives"?
The council most likely doesn't know 100% of what is going on with Sasuke. Shikamaru's father is looking at Danzou, almost with a suprised expression, because it is something he didn't know either. He only knew that he wanted to kill Itachi.... and that is no secret... Sasuke was saying that since he was a child!!!
Only us as readers know that Sasuke went after the 8-Tails... and that Sasuke is returning to Konoha. Its almost as if Danzou is expecting Sasuke to return, and will use his return to solidify the councils' choice in making him Hokage!?!?!
I won't accept that Danzou is Madara/Tobi ... However, Danzou has shown that he is willing to "make friends" with Konoha's enemies in order to improve his own status... ie with Hanzou. I won't be surprised if we see Madara conversing with Danzou at some point in the future... possibly in the next 5 mangas...