As any minor release, it's mostly bug fixes. Most interesting one are about the handling of the different Chinese languages that are now correctly recognized by the application.
The profile notification now respect the global notification type setting.
The rest are related to the Changelog window (that you might be using to read this now :D) and to the downloading of new versions.
ps: Changelog is for 5.7.1 & 5.7.2 was released directly after to fix missing files in the installer.