Got the invite for the interviews during the afternoon - ironically after spending my time since yesterday afternoon refreshing my inbox every 5 minutes, the email came when I actually got distracted with something at work for a couple of hours, nice surprise coming back to the desk.
For future people going over this thread in detail in the hope of getting some more insight into the admission process (which I might or might not have done with old threads): AOs will not send all the invitations out at once apparently, so if others have gotten an invite but not you, don't worry to much and wait for the email