I've seen the list of PhD admits (there were 9, I think), and got an email a week ago requesting hosts for the visit days. So I suppose it's technically possible people haven't been notified yet, but the odds of that are next to nothing.
I'm not an applicant, but a current student. CMU sent out acceptances for both the masters and PhD programs weeks ago. Visit weekends for both are scheduled for later this month/early next month. Not sure of the status of rejections. I believe they typically don't keep a waitlist, but I can't 100% promise that that's the case this year.