I have had sons sit both 11+ & 13+ 10 Jan and 14 Jan respectively and haven't heard or been called for an interview for either.
My gut feeling is that isn't good news as i know quite a few 11+ have been interviewed already.
I wondered if anyone had been rejected already or knew if they leave it until the last minute to send you a rejection if your son hasn't passed.
I would rather know now if its a no as the wait is agony!!