Naruto Volume 56 is all about the Great War, so expect this mannga to have a lot of fights(the downside is, dont expect the story to move forward much). Thus the tone is very gritty and serious, that theres not even one funny moment in this volume... actually there is one, but its done for the sake of a fight. There are a lot of very cool, powerful, but unknown(to the readers anyway) characters in both sides here, but Kishimoto did a very good job introducing them and explaining their powers. The fights themselves are entertaining, and most are cleverly done. The art is on par with past volumes as well.
My only complain in this volume is that Naruto and other major characters were hardly shown here, some doesnt even show up at all. It almost feels like Kishimoto is just prolonging the story for money purposes(in which I dont blame him). Overall, still a great volume, and 57 should be great.