Differences between 2.10.56.0 and 2.10.57.0 include but aren’t limited to:

General:

• Six-player groups should no longer experience difficulty auto-joining open sea battles.
• Active Nation Change items in the Treasure Aisle shop now take effect immediately upon use.
• This version also includes some updated localization files.

Release Notes for build 2.10.56.0 are here.