When classes for the 2015-16 school year start next month and in September for one, the nine law schools in Illinois will welcome 12 instructors either new to the school or in different roles.Two schools — DePaul University College of Law and University of Illinois College of Law — have new deans, while two others have interim deans: Mark W. Cordes at Northern Illinois University College of Law and Geoffrey R. Stone at University of Chicago Law School.Other than Dean Jennifer L. Rosato Perea, DePaul has no new …