Aside from a real logo, the PureOS installer needs a much better slideshow, that looks interesting and conveys more of what PureOS actually is about, and which features will be available to the user after the installation has finished.
At the moment, we are running with a placeholder slideshow that is neither informative nor fun to look at.
You can find a few example slideshows here: https://github.com/calamares/calamares-extensions
The page also contains an example on how to view the slideshow with qmlscene, so it can be tested before incorporating it into the installer.
Our current slideshow (as well as all other installer branding) can be found here: https://source.puri.sm/pureos/core/calamares/tree/master/debian/pureos-branding