The Fall, 2012 Cohort started orientation this past July, so you definitely should have received notification regarding that. If you did not, it is possible that your application was incomplete. You might want to contact nurse employment at (919) 966-2012, particularly if you are interested in applying for the next new graduate program.
The Winter, 2013 cohort, application period has not yet opened. According to the UNC Health Care New Graduate Nurse
site, that application period will open 24 September, with a projected start date of February 2013.