Hang in there, it sounds like there are still a lot of appointments that have not yet been offered, and I have been watching the forums and have not seen very many people from MN yet announcing their appts.
Also if you are not already doing it, keep checking your on-line status. My son never received a call or a letter from his nominating MOC' office on either his nomination or appointment. He found out about his appointment by checking his on-line status, and one day it just said "Appointed Offered". Then the envelope arrived in the mail about 4 days later.
Good Luck, and let us know!