On the repository, there are qt5 packages - but they are for armv6h generally - not for raspberry pi specificly, therefore; it lacks eglfs support (GL ES support). One can download sources and compile, but this takes ages. Many has done this- I didn't find binary packages from anywhere, therefore I created them. They might not suite for everyone, so some people might want to compile their own set - but for ones who want a quick start with Qt5 and rather use arch than raspbian.. Fetch your packages. Site provides 2 branches. Also pkgbuild files are included and some notes for people who want to compile by their own.
Anyway, the site URL is https://sites.google.com/site/qt51raspi/
I provide no support - haven't ever done anything with Qt by myself and don't know a lot about it. Just decided to see what it is all about and was cursing that compiling takes ages when the result might be that I decide that Qt is not my thing
Here's a jump start for other ones who feel curioisity about Qt5.