Wait and see, I'd say... I interviewed last week, but I think that was because I'm a "nontraditional" applicant. The acceptance came via e-mail, and again, the Sunday notification may just be a quirk of my situation, since my interviewer promised to get back to me within a week. My acceptance isn't reflected on the IU website yet, so I imagine there's a stack of decisions on someone's desk waiting to be input...and maybe that will trigger the rest of the notifications...?
Let me know what happens; I'll hope for the best for you!