It's good to see language compatibility mentioned, and I hope they follow through with it.

There were really fantastic Common Lisp bindings for Qt4, but they relied on a tool called "Smoke", which stopped working with Qt5. My understanding is Smoke was used to create the early Python binding, but a different mechanism was used for the Python bindings in Qt5. For some reason the new technique wasn't as easy to use from other languages, so a lot of alternative language bindings stagnated on Qt4.

I don't know if it's improved lately, but between using C++, the non-standard moc pre-processor, qmake, and little support from Qt itself, it's really hard to generate bindings for Qt now.