Why is Fisher taking so long?

Linda Greenhouse says:

One reason might be that Justice Anthony M. Kennedy, who almost certainly received the opinion assignment in the Texas case, isn’t going far enough in that case to satisfy the other conservative justices. Under this theory, those justices responded to what they saw as a frustratingly narrow Kennedy opinion by jumping aboard the Michigan case as the next potential vehicle for shutting down affirmative action....

Fisher is the case argued last October, about the University of Texas affirmative action program, but the court granted cert. just last March in a case about Michigan's ban on all affirmative action in public university admissions. (That case is called Schuette.)