It will contain ten chapters, 535 – 544, featuring Naruto finding out about the 4th Great Ninja War in the midst of his training. Revelations include how Raikage/Bee’ became brothers, Minato’s meeting with the Raikage, and the return of Itachi! The cover for Naruto Manga Volume 57 hosts Naruto, Bee, the 8-Tails, 9-Tails, Madara, and the Demonic Statue. A fitting cover for the volume!
As for the North American version of Naruto manga volume 57, the release date has not yet been announced by Viz Media. We expect it will take some time for us to get it; probably a year or two at the pace they are being released. Currently, North America is on volume 51, which was released back on June 7, 2011. Amazon currently lists Volume 52 to be released in North America on September 16, while volume 53 is expected on December 6, 2011 and volume 54 on March 6, 2012.