It provides many improvements over Qt 5.2.0 as well as packages Qt Creator 3.0.1. As a patch release, it does not add new features and remains binary compatible with Qt 5.2.0.
libxcb-1.10 has one major library version change, for libxcb-sync.so
(from 0 to 1) and qt5 is the only package I could find that uses
this particular library.