So. What do you guess they are?

What are some explanations that would be defied? Maybe just random
captured
material that hasn't worked it's way to blend in with the more homogenous
areas. That seems pretty straightforward.


What is the relative orbital velocity of the patches to the homogeneous
material? The same?
Can you determine if the patches move at the same rate as the medium? If
not, why?
Is Cassini going to go into orbit in the vacinity of the rings to study
them? They are the most provocative
feature of that planet.