Valerio's saying that he e-mailed the most important Italian motorbike magazine, "Motociclismo", and that they assured him about having immediately informed Kawasaki about it.
He'll keep us posted about the evolution.
My personal comment is that even if it is out of warranty and the mileage is high, things like that should never happen!
If the bearings suddendly broke/cracked it's a very serious problem: bearings should just become worn out and create play but NEVER break!

I'm curious to know the feedback from Kawasaki: if they're serious they should send an inspector.