Any new or imported Qt Creator 4.2 "CLI" project (previous versions were not tested) has checkbox "run in terminal" activated, after building ide shows app output - and terminal window doesn't appear.
Terminal emulator selection doesn't matter.
But if manually unselect and select it again - terminal window starts to be displayed after build.
QT Creator installed via official GUI installer.
Here is sample video: https://youtu.be/xm5Vlofr57s