Qt 5.6 status: some build issues are required to be fixed before an RC can be released.
Qt 5.7 status: branching and feature freeze will be delayed at least a week.
There are no current plans to release a Qt 5.5.2.
Rene J.V. Berlin has posted an RFC - QProcess variant or separate class for launching applications GUI style.
ICS will have a webinar this week, Thursday Jan 14 on Qt Test Framework to discuss the basics of unit testing C++ classes and QML items using the
Qt Test Framework provided by Qt 5 and more. http://www.ics.com/learning/webinars