Dont be surprised but development of widgets/core libraries wasn't stopped, just fetch qtbase and inspect git logs. Keep in mind that there is QtCreator which based on QtWidgets and unlikelly will be based on something else. What kind of styling, qss?

What new widget class do you need?

You should check the http://qt-project.org/downloads and just download the QtCreator

They made my weekend

Objective Ruby ? What's that?

This is suggestion from articke to code in and I have no idea wtf it is

Qml is much better than html, thanks for anchors, transitions between states, animation and etc. One remaining thing I just waiting for fully usable version of desktop components.