Hi I have catched a bit of information on IRC, that may interest everybody. Those who have VBox 3 and want to test Mageia can setup their X server to use vesa drivers. (Boot using the second option that drop you in a shell, edit /etc/X11/xorg.conf with vi and that's ok !)
Mageia is running perfectly using this option, but there is no mouse integration ... Hope that it is useful
