Another really solid chapter. It is good to see the level of intensity really going up and showing that Madara really is worthy of being the villain that everyone fears. It was also good to see both Gaara and Sakura in action and the level of desperation in their attempt to bring keep Naruto alive and get him to Minato as quickly as possible.
Seeing team Orochimaru in action was nice, although I think Karin's abilities seemed quite random, for her to suddenly fight like that out of nowhere doesn't really make much sense. Still it was good to see their combo in action and it was definitely interesting to see that Spiral Zetsu is in fact fighting with a body. It was also good to see Orochimaru finally take action. I am really curious to see what his plan is. As Karin said the seem to be too late to save Sasuke alone.
I suspect that the body in Spiral Zetsu is Yamato. That is the only person who seems to make sense considering Yamato is one of the only Mokuton users in the series and he is the only known person who was being kept in Madara's hideout. Also, the body seems to have short black hair. I suspect Spiral Zetsu is using Yamato's power to amplify its Mokuton and also it is using the power from the bodies Zetsu ate over the years to grant it the power off all the elements.
I really believe that the person who will save Sasuke is Kabuto. Kabuto is one of the only people left who makes sense. He is one of the most skilled medical Ninja and one of the most powerful people at the moment. Kabuto is one of the few people who logically has the power to bring Sasuke back from near death. Kabuto also has a couple possible motives for reviving Sasuke. He is either acting according to Itachi's will, since Itachi could have left him a genjutsu message to protect Sasuke or Kabuto could be acting according to his own will and want to save Sasuke to use him. Either would make sense and be inline with the events so far. It will be very interesting to see who's side Kabuto is really on after being forced to reevaluate his life.