I think this page speaks volumes...
You must be registered for see links
Naruto states he knew what sasuke was thinking. i think sasuke and naruto are on the same page now... i think naruto is going to help sasuke with his plan. i also believe that sasuke has been putting up a front, like his brother, to earn trust from the bad guys.
this page
You must be registered for see links
is where i think we see naruto and sasuke understand each other. sasuke says, "you.... when did you..." but he doesn't finish the sentence. we are lead to believe he's talking to zetsu because zetsu answers. but what if he was talking about naruto... wondering when naruto became so strong or when did naruto begin to understand sasuke's plan.
I believe sasuke expects that zetsu is ALWAYS around watching him. sasuke can't hold back or go easy or zetsu would report it to tobi and sasuke wouldn't get his EMS. i think pretty much everything sasuke has told tobi is meant to manipulate the akatsuki. sasuke knew what would happen if he used his MS and he used it a lot on purpose because he needed a reason to take itachi's eyes and being near blind is a pretty good reason... but having to fight naruto while almost blind is a perfect reason to take the eyes... so tobi would never suspect.
during and after the encounter with danzou, sasuke attacked karin and sakura. i think this was because he EXPECTED zetsu to be watching and needed to keep up the facade. i think it's possible that karin told sasuke, off panel, that she sensed 2 chakra sources and one huge chakra source behind them and gaining.
i think sasuke assumed the huge chakra source was naruto, though i'm not sure he could've guessed the other 2. in any case, with the info that karin had told him he was able to time his attack at karin with the arrival of the first 2 chakra sources. that way karin could get away and the spying zetsu would see that sasuke wasn't holding back.
i think sasuke timed his attack on sakura with the arrival of naruto... so naruto could stop him from killing her. again, sasuke maintains his facade in front of zetsu and sakura isn't hurt.
i think naruto and sasuke are working together now. naruto wants to be the only one to fight sasuke because sasuke would have to hold back against anyone else and his cover would be blown. only naruto has the power to make the fight look good. also i think the smile on sasuke's face after getting itachi's eyes is because he feels close itachi now.