Thank you a lot for the suggestions :-)
At the moment I use the free version of Unity which doesn't allow having a custom logo on the splashscreen. The pickup you suggested are cool. Will probably work on this (in my free time).
If you launched it on other platforms, why is the headline making it sound like you're just launching it on WP8? Why is that news is what I'm asking, I guess.
FYI, It is unplayable on my low-end Lumia 520. I'm getting about 1 fps.
See answer about the shader above ;-)
Sounds like he is saying it is showing the default icon in the app listing, the icon in the Windows launcher. Not the splash screen.