Tested Qt Creator 4.14.0-beta1 (4.13.82) from package with Qt 5.15.1 and with Qt 6 beta 4 from online installer.
1. Project: Application (Qt Quick) wizards don't work with Qt 6 beta 4. Only Empty works - Scroll, Stack and Swipe don't. Neither qmake nor cmake version is working. I'm getting:
QQmlApplicationEngine failed to load component
qrc:/main.qml: module "Default" is not installed
The above works fine for Qt 5.15.1
2. Other Project: Subdirs Project - only generates qmake projects. After finishing and pressing "Finish and add subproject" button, I may open a wizard which asks me for build system - so, probably the build system should be automatically selected in this case (qmake). In addition: can't we have the same subdirs wizard for cmake?
3. Other Project: Empty qmake Project - should we also allow empty cmake project?