Given how Sasuke has been following a single minded path of revenge it makes sence to me that even after all that was revealed he still only has 1 thing in mind. And thats killing Itachi. No matter what he finds out that is still the only thing Sasuke is after.
As for Itachi I've been expecting it to be revealed that he is just plain bonkers under that calm additude. I mean thats kinda what you expect from a Psychopath. On the serface he's all calm and cool, but on the inside he's a screaming crazy person. In a way he's always reminded me of Hanabal Lecter. Only he doesn't eat his victims.