A Qt 5.7.1 snapshot is available:
http://download.qt.io/snapshots/qt/5.7/5.7.1/
They are not yet final packages, but are close. Here are the issues:
Current issues:
https://bugreports.qt.io/issues/?filter=17833
Known issues:
https://wiki.qt.io/Qt_5.7.1_Known_Issues
Posted by Jon Trulson