We have updated our Piwik from 1.x to 2.0.3.
I have seen the new superuser column in my fresh installation.
But i missed it in the migrated one... (the is also no way to create a second superuser). He should be migrated to the new once.
Damm, forget it.
I haven't seen that my fresh install was from git... 2.0.4 :)