Hey all, I just wanna try to put some of your minds at ease by sharing my personal experience with this process. I applied in last year's cycle and only received my first II in October for a December interview, and then didn't receive my second II (at my top choice school) until February for a late March interview on one of the school's last interview days for the cycle. I had been waitlisted after the December interview and was subsequently waitlisted after the March interview. The afternoon before graduation in May (less than 24 hours before walking across the stage, actually) I received a call from my top choice school (March interview) informing me that I had been accepted off of the waitlist.
I know that it's always easier to see things rationally when all has fallen into place, but I've been in all of your shoes, experiencing months of silence at a time. I know that the uncertainty of applying sucks, but the takeaway from all of this is that it is SO SO EARLY in the cycle right now. Many schools have only sent out one, two or maybe three batches of IIs, but there are MANY, MANY more to come. Schools will continue reviewing and re-reviewing and re-re-reviewing applications until February/March. Just because you haven't heard anything yet doesn't mean you should start panicking. Live your life and don't stress, it's out of your hands for now and good things will come your way.