Hi!
I did not receive an interview invite either!
I did receive an email notification of acceptance from the Chair of the Dept. with my initial advisor and dept. coordinator CC'd on Thursday, Feb. 4th. They notified me once my official transcripts are processed, I should receive my official letter from the graduate division.
I'm not sure if this is the first wave of acceptances, or if all notices have been sent out. Let me know if I can help in any way. ?