A short announcement, probably meaningless to most people, but who knows: I've created an Ubuntu PPA with the latest QBS. The reason why this might make some sense is that this PPA targets the older Ubuntu distributions. It's currently built for 14.04 (Trusty, which is no longer supported by Canonical), and I'll eventually upload the QBS package for 16.04, too.
This package can be useful to people distributing applications in the AppImage format, where one usually builds the application in one older distribution in order to increase the chances of it being runnable in as many Linux distributions as possible. A simpler way to obtain QBS on Trusty is to install QtCreator, but that's not trivial to install in an automated way and might not come with the latest QBS. Especially when building on Ubuntu, a package from a PPA is much easier to install.
This QBS is built statically, and won't install any Qt libraries on your system; this is good, because it allows you to use whatever Qt version you like without any risk of conflicts.