The prosecution held a press conference yesterday, announcing that the accident had been caused by icing, which had blocked the "extension of a flap" when the aircraft was on approach, resulting in the aircraft spinning out of control.
And CL300 said, zero flaps in icing on a C510 - I take his post as if that is a limitation. So either they busted a limitation when trying to extend flaps in icing (which I figure is not required on runway as long as Friedrichshafens) or...
A dude I bumped into today said, it was tailplane icing.