Per a U-M release, sophomore receiver Csont'e York is suspended indefinitely for "failing to meet team standards."
EDIT: Here is the press release
The following is a statement from University of Michigan head football coach Brady Hoke:
“Csont’e York is suspended indefinitely for failing to meet team standards and will not report for fall camp. We demand that every person in our program represent the University of Michigan and the Michigan football program the right way on and off the field. When people fall short of that, there are consequences.”