All decisions are rolling including dings and waitlists. If you look at last years thread around the middle of december you will see people were getting dinged. Waitlists came out later but did come out before the deadline. Admits were the first out but dings came not too long after.
Also your status for an admit will change online to something about sending official transcripts and scores. Your status if you are dinged will change to something about status being unknown. I recall that it changes but I don't remember exactly to what...but if your status goes from one thing to something else not about official transcripts its probably not the best sign.
Finally to really get you guys worked up. Online status often changed for people before they got phonecalls and before they got the ding email. Last year people would already know their decision and just have to wait until the end of that day or until the next day to get the "official" response. F5 is going to be getting a work out now isnt it.